SIAECOSYS SCJ3500
SIAECOSYS SCJ3500 is a 3.5-inch TFT color speedometer for electric motorcycles — sits between the SCJ313 (3.13") and SCJ3622-A (3.6") in the SIAECOSYS TFT family. 320×480 resolution, IP65 rated, −20°C to +70°C operating range. Dual-protocol: SIAECOSYS CAN BUS and ONE-LIN, firmware-selectable, plus direct Hall-effect speed sensor compatibility as a fallback. Wide operating voltage DC10–100V (narrower than the rest of the SCJ family's 12–150V range). Features Bluetooth pairing (appears as "CJ-BT" followed by 4 random digits) with caller-ID reminder, tire-pressure monitoring, 3W/4Ω single-channel amplifier output for a horn or speaker, and TPCY-C firmware upgrade. Two UI orientations available: landscape (default) or portrait (must be set pre-shipment by the seller — not user-switchable). Universal power display for Li-ion and lead-acid batteries. Backend configurable: voltage settings, voltage/speed coefficient, unit toggle, Bluetooth name, tire-pressure alerts.
In brief: E-bike display. Protocols: SiAECOSYS ONE-LIN, SiAECOSYS CAN BUS. From $45.
Specs verified Jul 26, 2026
Where to Find
Prices tracked across 3 sellersQS Motor
$44.77
AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
Out of stockAliExpress - SIA Tech Store
Out of stock* Shipping estimates are for the contiguous US and may vary by location.
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Price History
Current best price $42.46. Over the past 90 days: low $41.43, high $42.94, average $42.30 — about average.
- AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store
- AliExpress - SIA Tech Store
| Date | Price | Shipping | Total | Change | Coupon | Rating | Sales | In Stock | Status |
|---|---|---|---|---|---|---|---|---|---|
AliExpress - SIA Tech Store(8 records) | |||||||||
| May 29, 202609:17 PM | $42.94 | $41.30 | $84.24 | $0.00 | SSUS03−$3.00 | — | — | No | active |
| May 28, 202606:39 PM | $42.94 | $41.30 | $84.24 | $0.00 | — | — | — | No | active |
| May 27, 202607:32 PM | $42.94 | $41.30 | $84.24 | $0.00 | — | — | — | No | active |
| May 23, 202607:19 PM | $42.94 | $41.30 | $84.24 | $0.95 | — | — | — | No | active |
| May 22, 202605:02 PM | $41.99 | $41.30 | $83.29 | $0.02 | USSS05−$5.00 | — | — | No | active |
| May 21, 202605:14 PM | $42.01 | $41.33 | $83.34 | $0.00 | USSS05−$5.00 | — | — | No | active |
| May 19, 202605:09 PM | $42.01 | $41.33 | $83.34 | $0.11 | USSS05−$5.00 | — | — | No | active |
| May 18, 202605:05 PM | $41.90 | $41.22 | $83.12 | Initial | USSS05−$5.00 | — | — | No | active |
AliExpress - Zhejiang Siaecosys Technology Co., Ltd. Store(13 records) | |||||||||
| May 29, 202609:15 PM | $42.46 | $41.30 | $83.76 | $0.00 | SSUS03−$3.00 | — | — | No | active |
| May 28, 202606:37 PM | $42.46 | $41.30 | $83.76 | $0.00 | — | — | — | No | active |
| May 27, 202607:30 PM | $42.46 | $41.30 | $83.76 | $0.00 | — | — | — | No | active |
| May 23, 202607:19 PM | $42.46 | $41.30 | $83.76 | $0.00 | — | — | — | Yes | active |
| May 23, 202607:18 PM | $42.46 | $41.30 | $83.76 | $0.94 | — | — | — | Yes | active |
| May 22, 202605:01 PM | $41.52 | $41.30 | $82.82 | $0.00 | — | — | — | Yes | active |
| May 22, 202605:01 PM | $41.52 | $41.30 | $82.82 | $0.02 | USSS05−$5.00 | — | — | Yes | active |
| May 21, 202605:13 PM | $41.54 | $41.33 | $82.87 | $0.00 | — | — | — | Yes | active |
| May 21, 202605:12 PM | $41.54 | $41.33 | $82.87 | $0.00 | USSS05−$5.00 | — | — | Yes | active |
| May 19, 202605:08 PM | $41.54 | $41.33 | $82.87 | $0.00 | — | — | — | Yes | active |
| May 19, 202605:08 PM | $41.54 | $41.33 | $82.87 | $0.11 | USSS05−$5.00 | — | — | Yes | active |
| May 18, 202605:05 PM | $41.43 | $41.22 | $82.65 | $0.00 | — | — | — | Yes | active |
| May 18, 202605:04 PM | $41.43 | $41.22 | $82.65 | Initial | USSS05−$5.00 | — | — | Yes | active |
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Specifications
Specifications
- Protocols
- SiAECOSYS ONE-LIN, SiAECOSYS CAN BUS
- Screen Size
- 89mm
- Light Control
- No
- Phone Charger
- No
- Bluetooth
- Yes
Physical
- IP Rating
- IP65
Ports & Connectors
| Pin | Wire color | Function |
|---|---|---|
| 1 | Orange | Turn Signal Left |
| 2 | Black | Power Switch Signal |
| 3 | Green | Ground |
| 4 | Light Blue | Turn Signal Right |
| 5 | Blue | High Beam |
| 6 | Red | Battery + |
| 7 | Green / Yellow | CAN Low |
| 8 | Red / Black | CAN High |
| 9 | Purple | One-Wire Comm |
