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. Panel mount for easy install in a dash or instrument panel. 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).