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ob1 V3.1S LED System for Semi-Trailer 1ob1 V3.1S LED System for Semi-Trailer 2ob1 V3.1S LED System for Semi-Trailer 3

V3.1S - Standard Kit (4 LED cables included)

  • Install on Trailer, internal Bluetooth wireless connects and receive commands from V3.1M (v3.1M Unit separately available).
  • 10 LED Connectors available (only 4 LED cables included in this set); 
  • BR1-2 (Brake lamp)
  • L1, R1 (Left & Right signals)
  • AUX1-5 (AUX lamp)
  • REV (Reverse lamp)
  • Powered by battery box (AA size x 4, batterys not included)

V3.1S Standard kit includes:

  • Main unit x 1
  • SET Switch cable x 1
  • Extend LED cable x 2
  • REV LED cable x 1 (5mm WHITE LED x 2)
  • Brake LED cable x 1 (5mm RED LED x 2)
  • Left / Right LED cable x 2 (5mm YELLOW LED x 1)
  • Battery Box
  • User Manual (English / Traditional Chinese) x 1


  • Left / Right winker lamps
  • 2-level brightness brake lamp
  • hazard lamp
  • Reverse lamp
  • Toggle function (Hold for 3 sec. to change LED status, total 4 Toggle steps !)
  • Flash mode (All LED), Press SET switch anytime after power on to change total 7 flashing styles
  • FR2, AUX2, ROF connectors have 4 Power Options (Low/ Mid/ High / Extra High)
1 connector Max. can drive 16 LED (20mA) type
However if HIGH / EX-HIGH Power option used, external BEC (3A or 5A) may be required.

Support legs position detection


V3.1S Specification:

  • Bluetooth Protocol: Bluetooth Specification V2.0 with EDR
  • Input Voltage: 5-6VDC (Powered by BEC), absolute Max. 9V
  • Low Voltage Detection battery type: 1-6S LiPo / LiFePo / User define Max. 25.2V (V3.1M)
  • Support RC Modulation: High Response 2.4G system / PCM / PPM (FM) / AM (V3.1M)
  • Dimension (Main unit): 44mm (L), 38mm (W), 10mm (H)
  • Dimension (Battery box): 70mm (L), 65mm (W), 20mm (H)
  • Weight: Main unit 12g / Large unit 20g (Not includes cables)
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  • BRAND : ob1
  • MODEL NO. : ob1-V3.1S
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