Email us when you have problems.Features: 100% Brand new and high quality!Plug and Play.3" screen and high-definition display.Multi-color design makes the screen more abundant and easier to read.The use of nano-technology to eliminate unwanted reflections and can make display information more sharper.Display rich content: speed， engine speed， water temperature， battery voltage， fuel consumption，low voltage alarm， high temperature alarm， speed alarm，free switching between kilometer and mile，free switching between ℃ and ℉.Auto power on and off with vehicle started and shutdown， effective protection of the car battery; while retaining the manual switch mode， and more easy to control itself.Automatic and manual brightness adjustment mode， driving without glare.Specifications:Environment temperature - 40 0C— +80 0CBarometric press:86-106KPaRelative humidity:10%-95% Environment voice:<=60dBAlarm of sound level:>=30dB(A)Work voltage:9V~16Vdc(12Vdc/400mA)Size of product:9*5.4*1.2cmPackage included:1 x Universal 3" X6 Car Head Up Display Speed Warning System Fuel Consumption1 x User manualHope you can have a good shopping experience.