Real-time measurement of the vehicle roll and pitch angle during driving, range is -40 to +40 degrees. Measures the current altitude of your vehicle. GPS satellite positioning to help maintain correct direction. Suitable for travel and driving adventures. Displays current driving speed with overspeed alarm function, and shows local time. Real-time voltage monitoring helps prevent hazards caused by excessively high or low voltage, contributing to extended battery lifespan. Compatible with various vehicles including caravans, trucks, buses, cars, off-road vehicles, and SUVs. Plug and Play installation: 1. Plug the power cable into the vehicle’s 12V socket. 2. Connect the power cable to the device. 3. Place the device horizontally in a visible location and secure it with adhesive. Color: Black Material: Plastic Package Contents: 1 x Car HUD Display 1 x English Manual Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement error allowance is +/- 1-3 cm.