This hour meter works on any gas engines & generator, such as marine, ATV, motorcycle, dirt ski… Could track the service life of your machine, plan for oil changes, valve, adjustments, clutch service, chassis lubrication, and other maintenance schedules. Record and display to 9,999.9 hours. Stand-by time up to over 20,000 hours. Hour glass symbol appears and flashes on/off to indicate counting time. Automatic roll over resolution 0.1 hour. 100% epoxy encapsulated, waterproof, shockproof, high temperature resistance. Easy Installation: Just connect the hour meter & spark plug with the wire, then use the screws or zip tie to fix the hr meter. No battery required. Total hours accumulated is not re-settable and cannot be erased. Learning what to service and when, is the key to a successful preventative maintenance program for your gas engine & generator: vehicle, motorcycle, ATV, PWC, boat, snowmobile, dirt bike … Solid state electronics, modern LCD, superb environmental durability and enhanced functionality of Magicalmai hour meter offer the best of all possibilities without sacrifice to performance, operation, or budget. Package included: 1 x Magicalmai Inductive Hour Meter 1 x Wire 2 x Screw 4 x zip tie 1 x install drawing Magicalmai inductive hour meter specifications: