1. Easy to operate. 2. Easy to install, play and plug. 3. Real-time display of vehicle speed, speed and car fault alarms. 4. HUD short for Head Up Display. It displays driving datas on the front windshield such as speed, RPM, water temperature, voltage etc on the car front window glass; avoiding drivers unsafety because of watching the instrument while driving. Drivers can read the driving information instantly, and can always keep the best state on the way with HUD 5. Specification: Environment temperature: - 40 degree Celsius ~ +120 degree Celsius Barometric press: 86-106KPa Relative humidity: 10%-95% Environment voice: <=60dB Work voltage: 11V~18Vdc(12Vdc/200mA) Sleep current: <=30mA Display way: Virtual image reflection Display channel: LED Display Reflector transmittance: 98% Virtual image distance: 55 MM