Combine OBD & GPS HUD system into one, free switch. Freely switch between OBD and GPS modes.</br>5.8 Inch big screen HD display.Automatic and manual brightness adjustment modes.</br>Easy installation using your car's OBD-II port; mounts onto dashboard with adjustable bracket</br>You can keep your eyes on the road with this HUD, to be safer.</br>Notice：Some buyers told HUD can not power off automatically after car power off.The reference start/off voltage is 132, but sometimes after your car power off ,bettery may still offer current for HUD, so you should adjust your Reference voltage 132 to 135～138.so that it can automatically power on/off .</br></br>Product Description</br></br><b>NOTE</b><br><br><b> If no data display in OBD Mode, pls switch it to GPS mode, then HUD can work.</b><br><br><b>When the first time using the GPS mode, the search GPS takes about more than 1 hours</b><br><br><b>On the mountain, outskirts or the GPS can not cover the place, pls switch it to the OBD2 Mode.</b><br><br>Specification:</b><br/>Environmental noise: 《=60dB(A)<br> Alarm sound level: 》=30dB(A)<br> Working voltage: 9V~16Vdc(12Vdc/400mA)<br> Screen size: 13.5*8*1.5(cm)<br> HUD Weight: 120g<br> <b>Auto start and off setting</b><br/>The default start/off voltage is 132,if you found your hud failed auto start,you <br/>can try to reset your voltage to 128. <br/>Sometimes after your car power off ,HUD may still in working condition, so you <br/>should adjust your default voltage 132 to 135～138.so that it can automatically power off. <br/>If you do not want complex setting,you can also try manual close. <br><br> <b>Alarm wave on/off setting.</b> <br/>Long pull down the trackwheel for 5 secends: turn on or off the alarm sound.<br> <b>OBDII Main Functions:</b><br> 1.RPM,voltage,driving distance,water temperature,driving time<br> 2.Fuel consumption,water temperature,voltage<br> 3.RPM unit,voltage unit(V),driving distance unit(KM/Mile),water temperature unit(℃/℉）<br> 4.Fuel consumption unit(L/H, L/100km)<br> 5.All small circle lights turn off when driving speed exceed 50km/H<br> 6.Decorative light(will be turn on all the time when driving)<br> 7.All light circle turns off when the RPM exceed 4000r<br> 8.Vehicle speed<br> 9.Speed unit(KM/H,MPH)<br> 10.Display icon (from left to right): menu setting,shift reminder,engine fault code,over speed icon,light sensor,buzzer mark,fatigue driving,low voltage alarm,high water temperature alarm<br><br> <b>Package Included:</b><br> 1 x Head up display<br> 1 x ODB data line<br> 1 x Reflection paster<br> 1 x English User Manual</br><br/>http://www.amazon.com/gp/product/B01IXBF1R4