Description:This gear sensor is used to cut off the poweror shut off the motor when shift to avoid chain grinding and cassette breaking.It can protect your motor.The 1T2 cable is used to turn one 3 Pin female to two 3 pin females for connecting with shifts sensor, brakes etc.If your motor is Bafang BBS01B BBS02B And BBSHD series, you only need to buy the gear sensor. If your motor is BBS01 or BBS02 series, we advise you buy the 1T2 cable with gear sensor.Specification：Gear Sensor Material: ABSLine Length: 16.9inchShell material: MetalConnector: 3 pin female portY-Splitter Cable:Three Pin Yellow Waterproof ConnectorCompatible: BAFANG BBS01 BBS02 BBSHDY-SPLITTER 1T2 Cable For BAFANG Gear SensorBAFANG 1T2 Cable For Shift SensorLong Cable Length: 8 inchShort Cable Length: 20 inch Warm Note : 1.   The Gear Sensor acts like a Speed Sensor.2.   So you are able to shift your bike at full throttle and barely fill the throttle cut off.3.   It will make your BBS02 or BBSHD shift faster, smoother and safer.4.   The Gear Sensor is plug and play with any BBS02 or BBSHD in place of one of your e brakes and  is a 15 minutes install.5.   If you install it with our newest edition of BBS02 or BBSHD the controller has a separate e brake connector so you can use both e brakes and the gear sensor.6.   If you go with this setup the shifting power delay is much shorter than using the e brake connector.7.   However the gear sensor will work with all bafang mid drives by simply connecting it to one of the e brake cut off switches. It will also work with any mid drive equipped with an e brake cut off as long as the user can rewire it to fit their e brakes.