Quantity  1  Color  Blue  Material  PCB  Features  Main chip: LM393; With output status indicator light, lower level, light on; High level, light off; Working voltage: 3.3~12V; Output format: 0 and 1 digit  Application  widely be used in dynamo speed detecting or Arduino DIY project  Packing List  1 x Speed sensor module<img src="//112.74.112.28/down/products/150663/150663_000.jpg">