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The brake sensor cable is with sealed waterproof connectors; Easy to install; compatible with Bafang BBS01/BBS02/BBSHD/BBS01B/BBS02B mid motor, rear motor and front motor. How to work? Magnet close to the sensor, the e-brake is inactive ( motor runs ). Magnet moved away from the sensor, the e-brake is activated ( motor power is cut off ). If your bike is Hydraulic or Mechanical operated brake, then you will need the brake sensor to work with the BAFANG motors. 2 PCS contains 2 cables, 2 magnets, 2 sticky papers.