Type: Gear Sensor Function: Speed Shifter for Sensor Connector: 3 Pin in One Waterproof Connector Installation Location: Rear Derailleur Compatible: for BBS01 BBS02 Operating Voltage: 4-5.5 Current Consumption: 15ma Gear Sensor for Signal Output: Pulse duration 0.5s Protection Circuitz: Short Circuit & Polarity Reversed Protection 1. The Gear Sensor acts like a Speed Sensor. 2. So you are to shift your bike at and barely fill the throttle cut off. 3. It will make your BBS02 or shift faster, smoother and . 4. The Gear Sensor is plug and play with any BBS02 or 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 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 for 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. colour:black Material:ABS Package Contents: 1* one to two brake separation line 1* Gear Shift Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.