Features: Real-time measurement of the vehicle roll and pitch angle during driving, the range is -40~ +40.The current altitude of your car can be measured.GPS satellite positioning, make sure you don't go in the wrong direction. Perfect for traveling and driving adcentures.Obtain the current driving speed, with over speed alarm function, as well as display the local time.Real-timevoltage monitoring, can avoid safety hazards caused by too high or toolow voltage, prolonging the lifespan of the battery.Suitable for all vehicles, such as vans, trucks, buses, cars, off-road cars, SUVs, and other Vehicles. Specification: Power supply: DC10V~30V;Operating temperature: -40C~+80C;Pitch angle: -40~+40;Roll angle: -40~+40;Voltage measurement range: DC10V~30V;Voltage measurement accuracy: 0.5V;Speed accuracy: Detailed Explanation of Functions: Driving unit setting;Over speed alarm setting;Speed compensation setting;Time compensation setting--minus;Time compensation setting--plus: Pre and hold pre the function selection button to enter the above function interface, short pre it to adjust the parameters, and pre and hold the on/o button to save and exit. Plug & Play: 1. Plug the power line into the car cigarette lighter port;2. Connect the power line to the data part;3.Place the device horizontally in a visible position and fix it with 3M glue. Package Included: 1 x Car HUD1 x Cigarette Lighter Power Cable1 x Refitted Power Cable1 x Holder About Inclinometer only: Feature: 100% brand new and high quality.With free rotation type, its high degree of sensitivity, providing slope and inclination.Learn road conditions, increase traffic safety.Ergonomic design, adjustable viewing angle, fine workmanship.It can accurately show the exact degree downhill, uphill.Details can locate the slope angle of the left or right.Adjustable stand can be installed in any position, as long as you can maintain a balance.Built-in LED lights.Practical and durable Specification: Material: ABS+PMMASize: As picture showAccuracy: 2