Searon Digital Backlit Engine Tachometer Hour Meter with sparking plug Temp Temperature Sensor for RC Toys PWC ATV Motorcycles Marine Engines Chain Saws Tractors Lawnmowers Backlight Tachometer and Hour Meter With Spark Plug Temp Function. Temp display:-20~300 / -4~572 Internal replaceable CR2032 battery and Data will not lose while replacing the battey Tachometer from 0-25,000 RPMs with Max RPM Recall Function, non-resettable total hours from 0-99,999.9 hours. Customizable warnings and maintenance reminders from 1-999 hours with flash alert service alarms CE & RoHS Certification and 2 Years Warranty