After fine processing, it is well assembled, durable, waterproof and durable.Efficacy: The 1:1 auxiliary sensor is perfect for pedal-assisted electric bicycle drive systems, saving you work while pedaling, resulting in a constant and smooth pedal motor supply.Scope of application: Applicable to almost all electric bicycles on the market, small size, light weight, durable, shockproof, anti-corrosion and dustproof.colour:blackMaterial:plasticPackage Contents:1* SensorOnly 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.