Features1Durable Metal and ABS Material: Made of metal and ABS material, this digital tachometer is robust and durable for long term use. 2Waterproof LED Display: The LED screen display is clear, easy to watch, and simple to operate. With waterproof design, it can be used with confidence in rainy days. 3Wide Compatibility: Suitable for gasoline engines. The tachometer can receive signals from the engine, ignition coil, crankshaft sensor or speed sensor, etc. 4RPM and Hour Meter: When engine is off, it displays the total running hours and partial time. Partial time is resettable. When engine is on, it displays the total running hours and engine' current RPM. 5Light Weight and Compact: This digital tachometer is small in size and light in weight, so it will not add burden to the bike when mounted on an electric bike.SpecificationItem Type: TachometerMaterial: ABS, MetalWeight: Approx. 90g/3.17ozPackage List1 x Tachometer3 x Cable1 x Instruction