Main Functions 1. Display engine operating speed. 2. Display engine working time. 3. Set engine maintenance time. 4. with backlight function. Specification: Product Name: Tachometer Material: Metal + ABS Speed range: 0-20000RPM RPM Accuracy: 10RPM Item size: 73.5*46.7 mm Cable length: 18.5cm Power supply: Battery (replaceable) Battery type: CR2450 1PC (battery not included) Speed system: Real-time speed display. When the engine is working, the LCD will display the current speed in real time for easy viewing. Speed range 0-20000RPM, speed accuracy: 10RPM. Timing system: Maintenance reminder. Maintenance time can be set for regular engine maintenance, and maintenance reminder time can be set according to engine needs. Maintenance time setting range: 0000.0-9999.9H Method: Countdown Countdown Default value: 0000.0H When the maintenance time counts down to 0, "SERVICE" will be displayed to remind you to maintain the engine. Package includes: 1x Hour meter