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-time voltage monitoring, can avoid safety hazards caused by too high or too low 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: -40°C~+80°C;Pitch angle: -40°~+40°;Roll angle: -40°~+40°;Voltage measurement range: DC10V~30V;Voltage measurement accuracy: 0.5V;Speed accuracy: SLOPE METER DISPLAY lntelligent slope system High precision display GPS+BDS dual-mode chip Real-time monitoringCar battery voltage Automatic turn on/off Connect by cigarette lighter cablework for 11.5-30V car 2 Alarm function Work all car B1(Non generic) 1. Only suitable for gasoline vehicles. Not suitable for diesel vehicles, hybrid gasoline vehicles, and other modified vehicles.2. Compatible with OBD2 system. (with year restrictions)3. Some special models are not compatible (see below)