The LATNEX HM-B016 is a digital wireless vibration activated hour meter that measures the working time of your engine. You can change the sensitivity level of the vibration detection (low, medium and high). The display lock function can prevent time usage during transport. It has a waterproof design which makes it useable in any weather conditions. Product features: Hour Meter: Total hours Vibration sensitivity: Low, medium and high JOB timer: Resettable JOB time Lock function: Can be locked when not in use Internal battery: CR2032 Data stored automatically Waterproof IP68 Specifications: Product dimension: 68mm×33mm×14mm LCD screen size: 25mm×13mm CE RoHS certification. Waterproof rate: IP68 Applications: Gasoline engine equipment, such as generators, lawn mowers, motorcycles, Chainsaws, Compressors, ATV, etc. User manual