Specification:Item Type: Mid Motor Speed SensorMaterial: Plastic, MagnetInterface Type: 3pinNumber of Pulses (Pulse/Cycle): 2 PlueRated Input Voltage (DcV): 4.2-5.5Operating Temperature: Minus20 to 45°CInstallation Location: FrameOutlet Length (mm), Wiring Type: G4.3Sensing Distance (mm): Approx. 5mm / 0.2inWaterproof Grade: IP65Size: Approx. 35-45mm / 1.4-1.8in, Approx. 32mm / 1.3inHow to Use:Mounting bracket and speed sensor assembly, installed in frame position, magnet block stuck in the wheel spokes, fixed with screws, speed sensor assembly fixed with screws, sensor and magnet block to adjust the distance position, and fixed. Speed sensor can be fixed with a tie or wire rope tied to frame (Note: tie or wire rope, the product does not come with, need to be provided by the customer).Package List:1 x Speed Sensor1 x Mounting Bracket1 x Magnet Block1 x Screw1 x Boult