Package included: you will be provided with 2 pieces inductive hour meters with 2 pieces wires and 4 pieces screws, enough quantity to satisfy your daily use requirements, and the sensible accessories of wires and screws will make your usage and installation more convenient Scope of application: the digital engine meter is widely applied for many mechanical equipments, like generators, vibrators, shredders, lawn mowers, motorcycles, automobiles, trucks, engineering vehicles and more, help you keep track of how much time you spend on your engine Waterproof material: the inductive hour meter is made of plastic material with epoxy encapsulated casing, waterproof, to shock, and can withstand temperatures of 85 degrees Celsius, and sturdy, can you for a long time Easy to install: you could connect the small hour tachometer and spark plug to the wire, then secure the meter with screws or zips No batteries needed, you just need to connect the spark plug to the wire, an to install Detailed parameter: the engine hour meter is designed with an LCD display, which can record to 9999.9 hours, the maximum speed range is 99999 RPM, and the standby time is over 20000 hours, and the screen of meter will flash to indicate the counting time size:5.4x3.6cm Material:plastic colour:Black Package Contents: 2 X inductive hour meters 2 X wires 4 X screws Only 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.