Feature:1. HD display,Automatic dimming,Default automatic dimmiOr press the key to adjust the screen brightness.2. Alarm function, safe driving, overspeed alarm function.3. Compatible with multiple vehicles USB (5-24V) can be used.4. GPS precise positioningeal-time synchronous display of data , satellite acquisition of datnot affected by weath.5. USB power supply,Speed,altitude,humidity,voltage,mileage statistics,datetime,Compass,overspeed alarm,temperature-time zoneSpecification:Features:Speed display, up to 999Km/h; The metric/mile unit can be switched by pressing the key.HD display,Automatic dimming,Default automatic dimmiOr press the key to adjust the screen brightness.Alarm function, safe driving, overspeed alarm function.Compatible with multiple vehicles USB (5-24V) can be used.GPS precise positioningeal-time synchronous display of data , satellite acquisition of datnot affected by weath.USB power supply,Speed,altitude,humidity,voltage,mileage statistics,datetime,,overspeed alarm,temperature-time zoneSpecifications:Material:PCOperating Voltage:DC5-24VScreen size:4.7 inchGPS band:GPS + BEIDOU + GLONASSIP65Sensitivity:-166dbmPackage List:1XDisplay1xUsb1xInstructions1xStickerPackage List:1XDisplay1xUsb1xInstructions1xSticker