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4.1 About this Volume

This is the shopping volume. It assembles the complete bill of materials for a HaleHound build with real part numbers; lists all 22 SKUs the vendor’s Shopify store carries, grouped by what they are; works out the all-in cost of each build path including the parts the store does not supply; and gives a decision matrix for when the kit is the right buy and when sourcing the parts individually wins. It closes with sourcing notes — substitutions, the specific traps, and the discrepancies worth knowing before ordering.

All store prices are USD as of 2026-10-16 and come from the Shopify catalogue snapshot. This is an active one-person catalogue; prices and stock move often, and several listed SKUs show as out of stock at any given time. Component street prices for source-it-yourself parts are given as approximate ranges and are even more volatile — treat them as planning figures, not quotes. Where a part number is the vendor’s own naming convention (for example “E07 – C1101”) it is reproduced as written and reconciled to the canonical part number.

4.2 The complete bill of materials

A fully-loaded HaleHound — every radio, portable power, a case — is the sum of the parts below. The “Role” column maps each to its deep-dive volume; the “In kit?” column shows what the DIY kits supply versus what the builder adds.

Table 1 — 2. The complete bill of materials

#	Part	Canonical part number	Role	In DIY kit?	~Street price
1	CYD board	ESP32-2432S028 / E32R28T / E32R35T	Base platform (Vol 2)	Yes (exposed-SPI)	$8–18
2	Sub-GHz radio	CC1101 HW-863	Stock sub-GHz (Vol 3)	— (kit ships E07)	$3–6
3	Sub-GHz PA radio	Ebyte E07-433M20S	+20 dBm sub-GHz (Vol 3)	Yes (“E07 – C1101”)	$8–12
4	2.4 GHz radio	NRF24L01+PA+LNA	Stock 2.4 GHz (Vol 3)	— (kit ships E01)	$3–5
5	2.4 GHz PA radio	Ebyte E01-2G4M27SX	+20 dBm 2.4 GHz (Vol 3)	Yes (“E01 – NRF27sx”)	$10–15
6	NFC/RFID	PN532 V3 (Elechouse), SPI	NFC suite (Vol 3)	No — removed from kits	$8–12
7	GPS	ATGM336H (w/ ceramic ant.) / GT-U7 / NEO-6M	Wardrive, geotag (Vol 3)	Yes (ATGM336H)	$6–12
8	Buck converter	AMS1117-3.3 module / MP2307 (500 mA+)	Independent 3.3 V for PA (Vol 3/6)	Yes	$1–3
9	Boost converter	5 V step-up module (e.g. MT3608-based)	Battery → 5 V (Vol 6)	Yes	$2–4
10	Battery	3.7 V 5000 mAh 1S LiPo (105080), PH2.0	Portable power (Vol 6)	No	$12–18
11	Decoupling cap	10 µF across NRF24 VCC/GND	Stops NRF24 resets (Vol 3)	Often loose/builder	<$1
12	microSD card	FAT32, any capacity	Loot/.sub/OTA (Vol 2/8)	No	$6–10
13	Carrier (Classic)	Cinder Ferret V1/V2/V2.2	Holds radios (Vol 5)	Yes (V2 std.)	$30–40 (as SKU)
14	Integrated board (Fire Weasel)	Fire Weasel board + leash	Pre-placed radios (Vol 6)	Yes in FW kits	$48 (as SKU)
15	Harness	8-pin + 12-pin JST (Classic) / 4-pin UART (FW)	Interconnect (Vol 5/6)	Yes	incl.
16	JST connectors	Female PCB 8-pin + 12-pin	Mate the harness	Yes	incl.
17	Case	3D-printed, per board/path	Enclosure (Vol 2 §10)	Yes (kit case)	$30–45 (as SKU)
18	Case hardware	M3 × 10 or M3 × 16 screws	Assembly	Yes	<$2
19	Wi-Fi antenna	Bolton Dart (2.4 GHz)	NRF24/Wi-Fi (Vol 6)	No	$25–35
20	Sub-GHz antenna	ANT700 telescopic	CC1101 (Vol 6)	No	~$30

Note — The vendor’s kit naming collapses two distinct choices. “E07 – C1101” is the Ebyte E07-433M20S, a CC1101 with an integrated power amplifier — not a bare HW-863 CC1101. “E01 – NRF27sx” is the Ebyte E01-2G4M27SX, an amplified NRF24. Because the kits ship the amplified Ebyte modules, the independent 3.3 V buck is mandatory out of the gate (item 8). A builder sourcing parts separately can instead use the cheaper stock HW-863 CC1101 and plain NRF24L01+PA+LNA, which the CYD rail can feed — trading range for simplicity. Volume 3 covers the power difference.

4.2.1 Tools and consumables the BOM assumes

The DIY kits ship parts, not a workshop. The store spells it out: “NOT INCLUDED: battery, antennas, PN-532 NFC/RFID module, firmware, solder, or tools.” A Classic or Fire Weasel build assumes the following on hand — none exotic, but a buyer with no bench should budget them:

Table 2 — The DIY kits ship parts, not a workshop. The store spells it out: "NOT INCLUDED: battery, antennas, PN-532 NFC/RFID module, firmware, solder, or tools." A Classic or Fire Weasel build assumes the following on hand — none exotic, but a buyer with no bench should budget them

Tool / consumable	Needed for	Note
Soldering iron (temp-controlled)	Battery pads, radio pins, harness	Fine tip; the BAT± pads are small
Solder + flux	All joints	Leaded or lead-free; flux helps on pads
Flush cutters / wire strippers	Harness, leads
Multimeter	Continuity + polarity before power-on	Mandatory — Volume 5/6 smoke test
Small Phillips / hex driver	M3 × 10 or M3 × 16 case screws	Kit-dependent
microSD card reader	Formatting FAT32, OTA staging	Host-side
Data USB cable (A-to-C or A-to-micro)	Flashing	A data cable, not charge-only (Vol 2 §7)
Chrome or Edge on a desktop	Web-Serial flashing	Safari and phones cannot flash (Vol 7)
Heat-shrink / Kapton tape	Insulating the LiPo joint	Good practice on a soldered cell

Tip — The one tool a HaleHound build should never skip is a multimeter. The independent-buck wiring and the soldered battery are both places a reversed lead or a shared-rail mistake destroys a module or vents a cell. Volume 5 and Volume 6 both gate first power-on behind a continuity-and-polarity check; the meter pays for itself on the first build.

4.3 What is not in the box

The most common source of post-order surprise is the gap between “complete build” and “ready to transmit.” Four things are never included on any SKU, and a fifth — the PN532 — was removed from the DIY kits.

Table 3 — 3. What is not in the box

Missing item	Which SKUs	Why / what to do
Firmware	All	Ships empty; flash free at flash.halehound.com (Vol 7)
Battery	All	Solder a 1S LiPo to BAT+ / BAT− pads; the cell’s connector does not plug in
Antennas	All	”Everyone has a favourite” — Bolton Dart (2.4 GHz) + ANT700 (sub-GHz) recommended
PN532 NFC module	DIY kits (and now most)	Removed; the store says in capitals “DO NOT CONTACT ME ASKING FOR A PN-532”
Independent 3.3 V buck	Source-it-yourself builds	Supplied in kits; a from-scratch builder must add it for the Ebyte PA modules

Warning — Even the Complete Build ($245) and Complete Unit ($235) are not plug-and-play. The store copy is explicit: “This is not a kit — the assembly and wiring are done. Two jobs are yours: flash the firmware at FLASH.HALEHOUND.COM, and solder your battery to the BAT+ / BAT− pads.” The battery leads are soldered, not connected via the cell’s JST — soldering a LiPo is a real (if small) fire-risk step, done with the cell disconnected and polarity checked. NFC-suite buyers must also source and add a PN532 separately. “Complete” means wired and tested, not loaded and powered.

Where the generic parts come from. The store supplies the HaleHound-specific items (carriers, Fire Weasel board, leash, cases); everything generic is a commodity part available from the usual channels. For a scratch or upgrade build:

Table 4 — Where the generic parts come from. The store supplies the HaleHound-specific items (carriers, Fire Weasel board, leash, cases); everything generic is a commodity part available from the usual channels. For a scratch or upgrade build

Part class	Typical source	Note
CYD boards, CC1101, NRF24, PN532, GPS	AliExpress / Amazon	Exposed-SPI CYD best bought as the HaleHound SKU
Ebyte E07-433M20S / E01-2G4M27SX	Ebyte direct / AliExpress	Genuine Ebyte for the PA spec
Buck/boost modules, caps, JST, M3	LCSC / Mouser / Amazon	Commodity; buy a handful of spares
microSD, antennas, LiPo	Amazon / local	Battery best bought locally to avoid shipping limits

Note — LiPo cells are restricted for air shipment; buying the battery locally or domestically avoids the surcharges and delays that come with importing one. It is one of the few BOM lines where the cheapest listed price is rarely the cheapest delivered price.

The recommended, store-linked consumables (prices as of 2026-10-16, drift expected):

Table 5 — The recommended, store-linked consumables (prices as of 2026-10-16, drift expected)

Item	Vendor reference	Approx.
2.4 GHz antenna	Bolton Dart (Amazon B0G8V5BRDM)	$25–35
Sub-GHz antenna	ANT700 telescopic (Amazon B01N3POQ92)	~$30
1S LiPo (4”/Fire Weasel)	3.7 V 5000 mAh 105080, PH2.0 (batteryint.com)	$12–18
1S LiPo (3.5” alt.)	PS3-controller-style cell (Amazon B09726K2LC)	$8–15

4.4 The 22 SKUs, grouped

The catalogue’s 22 SKUs sort into seven groups. Prices are the store’s as of 2026-10-16; availability flips frequently and several show out of stock.

Complete builds (wired, tested, empty)

Table 6 — 4.1 Complete builds (wired, tested, empty)

SKU	Price	Notes
4in HaleHound Complete Build	$245	Hand-built on a QDtech 4” ST7796 panel; ~5.5-week lead time
3.5” HaleHound Complete Unit	$235	Hand-built 3.5” ST7796; small-batch

DIY kits — Classic path

Table 7 — 4.2 DIY kits — Classic path

SKU	Price	Ships
DIY HaleHound 3.5” kit	$149	E32R35T CYD, E07, E01, V2 Cinder Ferret, ATGM336H, buck, boost, 8/12-pin JST harness + connectors, case, M3×16
DIY 2.8 HaleHound kit	$139	Same complement on a 2.8” E32R28T

DIY kits — Fire Weasel path

Table 8 — 4.3 DIY kits — Fire Weasel path

SKU	Price	Ships
4in DIY Fire Weasel kit	$198	4” E32R40T exposed-SPI CYD, Fire Weasel board + leash, E07, E01, ATGM336H, buck, boost, 4-pin UART harness, case, M3×10
Fire Weasel + leash PRO DIY kit	$185	3.5” E32R35T CYD + Fire Weasel board + leash + full radio/power complement, M3×16

Fire Weasel parts

Table 9 — 4.4 Fire Weasel parts

SKU	Price	Notes
Fire Weasel board + leash (DIY, un-soldered)	$48	Board + leash only; bring the CYD and radios
Fire Weasel board + leash (fully soldered)	$78	Same, assembled and tested
Weasel leash replacement	$8	Spare flat-cable leash

Cinder Ferret carriers (Classic)

Table 10 — 4.5 Cinder Ferret carriers (Classic)

SKU	Price	Notes
Cinder Ferret V2.2 DOUBLE NRF	$40	Dual-NRF24 for full-spectrum 2.4 GHz; ships soldered
Cinder Ferret V2	$40	Adds on-board ATGM336H GPS (1.25 mm JST); ships soldered + harnesses for all 3 modules
Cinder Ferret (V1)	$30	Original carrier; plug-and-play CC1101 + NRF24, soldered + harnesses

Bare CYD boards

Table 11 — 4.6 Bare CYD boards

SKU	Price	Notes
3.5” CYD exposed-SPI	$18	E32R35T, ST7796 320×480
2.8” CYD E32R28T exposed-SPI	$15.85	ILI9341 240×320; the cheapest entry

Cases and novelty / accessories

Table 12 — 4.7 Cases and novelty / accessories

SKU	Price	Notes
4” HaleHound case	$30	For the complete-build-class unit
CASE 2.8” (E32R28T / 2432S028R options)	$30	Select the variant matching the CYD
3.5” case (DIY, not Fire Weasel)	$30	PETG; for the original 3.5” build
Fire Weasel “bone pile” case	$45	Reworked for the Fire Weasel board
Talking Sasquatch 3.5” case	$45	Limited run; HaleHound-specific
Talking Sasquatch “Bone Pile” 3.5” (DIY only)	$45	Cut for an SS12F16-G3 switch
Slimer / The 90’s Were Awesome	$30 each	Themed case/skin variants
DefCON 34 SAO	$28	Simple Add-On badge (C3 super-mini); not a build part

  22 SKUs at a glance — count by group
  Complete builds   ██                    2
  DIY kits          ████                  4
  Fire Weasel parts ███                   3  (one SKU, two variants + leash)
  Cinder Ferret     ███                   3
  Bare CYD boards   ██                    2
  Cases             ███████               7
  Novelty/badge     ██                    2  (+ DefCON SAO)

Note — The DefCON 34 SAO ($28) is a conference “Simple Add-On” badge running a C3 super-mini, designed with zR_CrackiiN of Nyan with firmware from JboHack — it is HaleHound-branded merchandise, not a build component. It is counted among the 22 SKUs for completeness but plays no part in any build path.

4.4.1 Carrier evolution — which Cinder Ferret

Three Cinder Ferret revisions sit at two price points, and the differences decide what a Classic build can do. All ship soldered with harnesses.

Table 13 — 4.8 Carrier evolution — which Cinder Ferret

Revision	Price	NRF24 sockets	On-board GPS	Buy it when…
Cinder Ferret (V1)	$30	1	No	Budget Classic build; GPS wired separately
Cinder Ferret V2	$40	1	Yes (ATGM336H, 1.25 mm JST)	Want GPS on-board, single-NRF is fine
Cinder Ferret V2.2 DOUBLE NRF	$40	2	No	Want the firmware’s full-spectrum 2.4 GHz work

The V2 and V2.2 are the same price, so the choice between them is GPS-on-board versus dual-NRF — a build cannot have both from one Ferret. A dual-NRF build still gets GPS, just wired as a separate ATGM336H module (which the kits already include). For most offensive 2.4 GHz work the V2.2 is the stronger pick; the V2’s integrated GPS is the tidier choice for a wardriving-first build.

4.5 What each build path costs all-in

“All-in” means the device actually transmitting: the SKU price plus the four things the store never ships (firmware is free; battery, antennas, microSD, and — for NFC — a PN532 are not). The table assumes the recommended Bolton Dart + ANT700 antennas; a builder can spend far less on antennas and still work.

Table 14 — 5. What each build path costs all-in

Path	Starting SKU	+ Battery	+ Antennas	+ microSD	+ PN532 (opt.)	All-in (no NFC)	All-in (with NFC)
Complete 4”	$245	$15	$55	$8	$10	~$323	~$333
Complete 3.5”	$235	$12	$55	$8	$10	~$310	~$320
Fire Weasel 4” DIY	$198	$15	$55	$8	$10	~$276	~$286
Fire Weasel PRO 3.5” DIY	$185	$12	$55	$8	$10	~$260	~$270
Classic 3.5” DIY	$149	$12	$55	$8	$10	~$224	~$234
Classic 2.8” DIY	$139	$12	$55	$8	$10	~$214	~$224
Scratch (bare board)	$15.85	$15	$55	$8	$10	~$150–180	~$160–190

  All-in cost (no NFC, recommended antennas) — USD, approx.
  Complete 4"        ███████████████████████████████  ~323
  Complete 3.5"      ██████████████████████████████   ~310
  Fire Weasel 4"     ███████████████████████████      ~276
  Fire Weasel PRO    █████████████████████████        ~260
  Classic 3.5" DIY   ██████████████████████           ~224
  Classic 2.8" DIY   █████████████████████            ~214
  Scratch build      ████████████████                 ~165

Worked example — a Classic 2.8” build on the air

A concrete line-item list for the cheapest finished build with NFC and good antennas, to show where the money actually goes:

Table 15 — A concrete line-item list for the cheapest finished build with NFC and good antennas, to show where the money actually goes

Line item	Source	Cost
DIY 2.8” HaleHound kit (CYD, E07, E01, V2 Ferret, GPS, buck, boost, harness, case, M3)	Store	$139.00
Firmware	flash.halehound.com	$0.00
3.7 V 1S LiPo, soldered to BAT±	Third party	~$14.00
Bolton Dart 2.4 GHz antenna	Amazon B0G8V5BRDM	~$30.00
ANT700 sub-GHz telescopic	Amazon B01N3POQ92	~$30.00
microSD (FAT32)	Any	~$8.00
PN532 V3 (Elechouse) for NFC suite	Third party	~$10.00
10 µF cap (if not loose in kit)	Any	<$1.00
Total on the air with NFC		~$242

Trim it: skip NFC (−$10), use bargain antennas instead of the Bolton/ANT700 pair (−$40 or more), and the same device is under $200 on the air. The $139 headline is honest for the kit; it is the antennas and the optional PN532 that move the real number.

Two observations. First, antennas and a battery add ~$70–80 to every path — the cheapest sub-$150 kit is really a ~$220 device on the air with good antennas, though a builder willing to use bargain antennas can shave $40+ off that. Second, the scratch build is only cheaper if the builder already has tools, solder, and the patience to wire from pinouts (Volume 5); for most buyers the DIY 2.8” kit at $139 is the true floor because it bundles the carrier, harness, GPS, buck, boost, and case that a scratch build must source one at a time.

4.6 Buy-the-kit versus source-it-yourself

The decision turns on three things: whether the parts already sit in a parts bin, how much the builder’s time is worth against ~$40–70 of kit convenience, and whether the amplified Ebyte radios are wanted (the kits ship them; sourcing them individually is fiddly and is where the buck requirement bites).

Table 16 — 6. Buy-the-kit versus source-it-yourself

Factor	Favours buying the kit	Favours sourcing it yourself
Parts on hand	None	Already own a CYD, radios, buck, boost
Amplified radios	Want E07/E01 PA out of the box	Happy with stock HW-863 / plain NRF24
Soldering comfort	Moderate	High (wiring from pinouts)
Time budget	Limited	Ample
Carrier/harness	Want the Cinder Ferret + matched harness	Will hand-wire or use own perfboard
Case	Want the matched 3D print	Will print or improvise
Total spend	Lowest all-in for a first build	Lowest marginal if bin is stocked
Support	Vendor-matched parts, known-good	Self-supported

  DECISION
    │
    ├─ First HaleHound, no parts bin? ──────────► DIY 2.8" kit ($139) — best floor
    │
    ├─ Want it on the air fastest, minimal solder?► Complete Unit ($235–245)
    │
    ├─ Want low-friction build, bigger screen? ───► Fire Weasel PRO ($185)
    │
    ├─ Already own a CYD + radios? ───────────────► Cinder Ferret ($30–40) + harness
    │                                               or Fire Weasel board+leash ($48)
    │
    └─ Tinkerer with a stocked bin? ──────────────► Bare board ($15.85) + source rest

Tip — The Cinder Ferret V2.2 DOUBLE-NRF ($40) and Fire Weasel board + leash ($48) are the two already-own-a-CYD upgrade SKUs. The V2.2’s dual NRF24 is the only path to the firmware’s full-spectrum 2.4 GHz behaviour; if full-spectrum 2.4 GHz is a goal, the V2.2 is the one to buy rather than a single-NRF V1/V2. For an owner of a finished unit, the Fire Weasel board+leash is how a Classic build tries the integrated layout without buying a second full device.

4.7 Sourcing notes, substitutions, and traps

Harness and connector reference

The two build paths interconnect differently, and the kits ship matched connectors — a detail that matters when sourcing replacements. The Classic kits use JST-connectorised harnesses between the CYD, the Cinder Ferret, and the radios; the Fire Weasel uses a single 4-pin UART-delivery harness because the radios are already on the integrated board.

Table 17 — 7.0 Harness and connector reference

Path	Harness in kit	Connectors	Notes
Classic DIY (2.8”/3.5”)	Generic wiring harness, 8-pin + 12-pin JST	Female PCB JST, 8-pin + 12-pin	Mates CYD ↔ Cinder Ferret ↔ radios
Fire Weasel DIY (4”/PRO)	4-pin harness (delivers via UART)	4-pin	Radios pre-placed; fewer connections
Cinder Ferret V2	On-board GPS via 1.25 mm JST	1.25 mm	GPS integrated on the carrier
Spare leash	Weasel leash replacement SKU	flat cable	$8; the Fire Weasel board-to-CYD link

The leash is a wear item — it is the flexing flat cable between the Fire Weasel board and the CYD — which is why it is sold separately at $8. For a Classic builder, the 8-pin/12-pin JST female connectors are the parts to keep spares of; they are the interface a re-wire or a radio swap passes through.

Per-part substitution matrix

What can be swapped without firmware changes, and what cannot:

Table 18 — What can be swapped without firmware changes, and what cannot

Part	Safe substitutes	Do NOT substitute with	Consequence if wrong
CYD board	E32R28T ↔ 2432S028 (both 2.8” ILI9341 targets)	A non-exposed-SPI “CYD”	Pins not broken out; no clean radio wiring
CC1101	HW-863 ↔ E07-433M20S (PA mode toggle in Settings)	A non-CC1101 sub-GHz chip	Wrong driver; radio won’t init
NRF24	NRF24L01+PA+LNA ↔ E01-2G4M27SX	Bare NRF24L01 (no PA)	Much shorter range; otherwise works
GPS	ATGM336H ↔ GT-U7 ↔ NEO-6M	A GPS without a UART/NMEA output	Firmware auto-scans baud/pins; NMEA required
Buck	AMS1117-3.3 ↔ MP2307 (≥500 mA)	<500 mA regulator	Brownout under PA load
microSD	Any FAT32 card	exFAT / unformatted	SD and shared-bus radio faults
Antenna	Any band-matched SMA/U.FL	Wrong-band antenna	Poor range; possible PA reflection

Board, radio, and power sourcing notes

Board variant is a build dependency. Buy an exposed-SPI CYD (E32R28T 2.8” or E32R35T 3.5”), not a random marketplace “CYD.” A stock hobbyist board may not break out the VSPI and control pins HaleHound needs (Volume 2 §6). The Fire Weasel 4” kit specifically ships an E32R40T 4” exposed-SPI CYD.

CC1101: stock versus PA. The bare HW-863 CC1101 (+12 dBm) runs off the CYD 3.3 V rail and needs no buck — the simplest sub-GHz option. The E07-433M20S (+20 dBm) is the range upgrade the kits ship, and it requires the independent buck. They are pin-compatible for the SPI/GDO lines but the E07 adds TX_EN / RX_EN control pins (Volume 3). Enable PA mode in Settings → CC1101 Module after wiring an E07.

NRF24: the 10 µF cap is not optional in practice. Whichever NRF24 is used, solder a 10 µF capacitor across VCC/GND at the module. PA+LNA modules sag the rail on TX and reset without it; this is the single most-reported NRF24 fault and the fix is one cheap part.

Power modules. Any 3.3 V regulator rated 500 mA or more works for the independent buck — an AMS1117-3.3 module or an MP2307 both suffice. The boost converter is a generic 5 V step-up; the kits bundle one. A representative off-the-shelf charger/boost in this class is the Adafruit PowerBoost 1000C (shown below) — the kit part is a cheaper bare module, but the function is the same: take 1S LiPo up to 5 V for the CYD input.

Battery and antennas are yours. A 3.7 V 1S LiPo (the 4”/Fire Weasel kits suit a 5000 mAh 105080 cell) soldered to BAT+ / BAT−. For antennas, the vendor recommends a Bolton Dart for 2.4 GHz and an ANT700 telescopic for sub-GHz, but any SMA/U.FL antenna matched to the band works — this is the easiest place to spend less.

Antenna selection, by radio. Each transmitting radio wants an antenna matched to its band; a mismatched antenna wastes power and, on a PA module, can reflect energy back into the amplifier.

Table 19 — 7.2 Board, radio, and power sourcing notes

Radio	Band	Antenna class	Vendor pick	Connector
CC1101 / E07	300–439 MHz	Quarter-wave / telescopic	ANT700	SMA (module-dependent)
NRF24 / E01	2.4 GHz	2.4 GHz dipole/rubber-duck	Bolton Dart	SMA / RP-SMA
ESP32 Wi-Fi/BLE	2.4 GHz	PCB trace (on-board)	— (built-in)	None
GPS	GNSS	Ceramic patch	On ATGM336H module	u.FL / on-board

The ESP32’s Wi-Fi and BLE use the CYD’s on-board PCB trace antenna — nothing to add. Only the two external amplified radios and the GPS need antennas, and the GPS ceramic patch ships on the ATGM336H. So “antennas” in practice means two purchases: one 2.4 GHz and one sub-GHz. Matching the sub-GHz antenna to 433 MHz (not 915 MHz) matters because the firmware’s sub-GHz work centres on 300–439 MHz.

Note — A sub-GHz antenna cut for 915 MHz is a common mismatch error: it is the wrong quarter-wave length for the 300–439 MHz band HaleHound actually transmits on. The ANT700’s telescopic length can be adjusted toward 433 MHz; a fixed 915 MHz “LoRa” rubber-duck cannot, and will cost range.

Known discrepancies to carry into a purchase:

Table 20 — Known discrepancies to carry into a purchase:

Discrepancy	Reality
Store: CC1101 “300–928 MHz”	v4.0 firmware scopes features to 300–439 MHz (Vol 3)
Store: “27 dBm” NRF24	README TX-power table says +20 dBm (Vol 1/3)
Two 4” listings share one hero image	It is an AI-generated render, not a real unit photo
”Complete” build	Wired/tested only — still needs battery, firmware, antennas (§3)
PN532 “included” (older copy)	No longer bundled; source separately for NFC

Availability and re-pricing

This is a one-person Shopify store, and availability is volatile: at the 2026-10-16 snapshot both complete builds and the 3.5” complete unit showed out of stock, while bare boards, carriers, Fire Weasel parts, and most cases were available. Build the shopping list around what is in stock, and expect prices to move — the catalogue is re-saved frequently. To re-verify before ordering, re-pull https://halehound.com/products.json through the shared fetcher (the research dossier at ../research/halehound/ keeps the provenance snapshot) rather than trusting the figures frozen here.

Table 21 — 7.3 Availability and re-pricing

Group	Typical availability (2026-10-16)	Lead time
Complete builds	Often out of stock	~5.5 weeks hand-built
DIY kits	Usually available	Ships from stock parts
Cinder Ferret / Fire Weasel parts	Available	Fast
Bare CYD boards	Available	Fast
Cases	Mixed (some limited runs sold out)	Print-to-order on some

Note — Orders over $100 ship signature-required with tracking — the vendor cites fraudulent chargebacks as a small-shop problem. Factor a home-to-sign delivery into planning, and note that complete builds carry a multi-week hand-build queue on top of shipping.

Sanity-check before ordering

A short pre-order checklist that heads off the recurring mistakes in this volume:

  BEFORE YOU ORDER — tick each
  [ ] Board is an EXPOSED-SPI CYD (E32R28T / E32R35T / E32R40T), not a random "CYD"
  [ ] Case matches the exact board size AND build path (Classic vs Fire Weasel)
  [ ] Budgeted the 4 not-in-box items: battery, antennas, microSD, (PN532 if NFC)
  [ ] Sub-GHz antenna is cut/adjustable for 433 MHz, not 915 MHz
  [ ] If using Ebyte E07/E01 PA radios → independent 3.3 V buck is in the cart
  [ ] 10 µF cap on hand for the NRF24
  [ ] A real DATA USB cable + Chrome/Edge desktop for flashing
  [ ] For full-spectrum 2.4 GHz → Cinder Ferret V2.2 (double-NRF), not V1/V2
  [ ] Checked live stock + price (products.json); several SKUs sell out
  [ ] Someone will be home to sign (orders >$100)

Clearing that list is the difference between a build that works on first power-on and a bench full of parts that almost fit. Everything on it traces to a specific failure documented earlier in this volume.

The single best starting point for someone who has never built one remains the DIY 2.8” kit at $139: it bundles the exposed-SPI board, the amplified radios, the Cinder Ferret carrier, the GPS, the buck and boost converters, the harness and connectors, the case, and the screws — every item a scratch build would otherwise chase across four distributors — leaving only the four never-in-box items (battery, antennas, microSD, and the optional PN532) to add. For roughly $214–242 all-in it reaches a transmitting device, and nothing else on the bench covers Wi-Fi, BLE, sub-GHz, 2.4 GHz, NFC, and GPS from one touchscreen for that money.

Warning — The amplified radios transmit at up to +20 dBm (100 mW) on sub-GHz and 2.4 GHz. Even assembling the parts implies an intent to transmit at power levels that are restricted or illegal outside a lab or authorized engagement in most jurisdictions (FCC Part 15 and 47 U.S.C. §333 in the US; equivalents elsewhere). The parts are cheap; the legal exposure is not. Volume 12 collects the authorization envelope. With the parts chosen, Volume 5 builds the Classic path and Volume 6 the Fire Weasel.