BAFANG Gear Sensor 8Fun Gear Shift Sensor for Electric Bicycle Accessories Electric Bike Speed SensorBlack 1 Plastic

Gear Shift Sensor ( Black 1, Plastic): ?Connector: 3PIN male ?Length: 43cm ?Water Proof: IP65 ?Material: ABS ?Function: Cut Power during Gear Shift to avoid chain grinding and cassette breaking Gear Shift Sensor ( Black 2, Metal): ?Connector: 3PIN male ?Length: 43cm ?Water Proof: IP65 ?Material: Metal ?Function: Cut Power during Gear Shift to avoid chain grinding and cassette breaking Gear Shift Sensor---Cut power during gear shifting;Bring some smooth shifting feeling to rider;Avoid some problems like chain or derailleur damaged