This product is for drivers' safety，at high speeds，especially in high-speed driving at night，in order to avoid the driver to look down their head to watch the instrument，and decrease car accident.<br />The HUD can display driving data on the front windshield such as speed on the car front window glass;avoiding drivers unsafe 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.<br /><br />Our HUD display below information:<br />Vehicle speed<br />Real time<br />Satellite number<br />Altitude<br />Driving direction<br />Over speed alarm<br />Auto power on and power off<br />Free seitching between kilometer and mile<br /><br />Specification:<br />Voltage:DC8-18V<br />Current:40mA<br />Sleeping current:15mA<br />Compass precision:÷1▲<br />Speed range:0-400KM<br />Real timr precision：The same as satellite<br />Protection circuit:Reverse voltage<br />Satellite positioning time:99*90*23mm<br />12V Car charge:100mA<br />USB Cable:1m<br /><br />Package included:<br />1 x Head Up Display<br />1 x USB Cable<br />1 x Reflection Film<br />1 x Mat<br />1 x English User Manual