This is a speedometer for . Automatically adjust brightness, configure sightseeing elements to automaically adjust the brightness of the viewer. Professional , high-performance processing chip, strong performance and compatibility. It is compatible with all vehicles, . Features - Color: Black. - Material: PC+ABS. - Size: About 14.6 x 8.8 x 4.8 cm. - Automatic sensitivity brightness adjustment and manual brightness adjustment can adjust the most suitable brightness according to the light. - PC material resistant to high temperature and cold, capable of normal operation in various temperature environments. - LED color display USES metal nanotechnology to remove excess reflection and make the picture clearer. - High performance processing chip, strong performance and compatibility, dual running memory and processor ensures smooth operation at high speed. - Intelligent power saving, automatic machine. Specification Temperature : -40-+120°C Humidity : 10%-95% Operating Voltage : 11V-18V : ≦60db Air pressure : 86-106Kpa Standby current : 20mAh Package list: 3 x speedometer