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Function: To protect the bike, especially chain, motor,gear, etc. During the riding, after your bike fit the gear sensor, when you change the gear, the gear sensor will cut the power of whole bike, the motor will stop working, the chain also turn slower, it is more fluently to shift the gear, and protect the bike well. Operating voltage: 4-5.5 VDC Current consumption: 5mA Signal Output: Pulse duration 0.1s Protection circuit: Short Circuit & Polarity Reversed Protection Housing material: Intensive ABS International Protection: IP67 Operating temp/hum: -25℃ ~ +70℃ ; 85 % RH Size(L*W*H): 47mm * 18mm * 12mm