Yamaha's Engine Meters help you keep track of your engine's operating hours. The Deluxe Engine Meters include pre-programmed service intervals at 10 hours (initial) and every 50 hours thereafter. A flash alert displays for a 2-hour period upon reaching the specified interval. Includes hour meter and tachometer functions. Operating temperature: -40°F-160°F; -40°C-71°C. Battery life is 7-10 years (non-serviceable). *Works with all Yamaha gasoline generators and pumps.