The TTO Digital Temperature Gauge allows you to easily monitor your engine's temperature -40° - 300°C/575°F ensuring you that your engine is not over heating. Trail Tech's TTO Temperature Gauge offers features that include an easy-to-read LCD display, and an ultra-thin design. The LCD display lets you to easily view all gauge readings regardless of the angle or lighting conditions. Surface mount for easy install. Customizable warnings and maintenance reminders with flash alert service alarms. Functions on key switch for external power if battery dies. Specifications: Temperature (°F/°C): -40 - 300°C/575°F. Backlight: Yes. Internal battery: Yes. Battery life: 5 years. Screen: 24 X 14 mm (1 x 0.5"). Physical dimensions: 45 x 31 x 17 mm WxHxD (1.75 x 1.22 x 0.7" WxHxD).