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 trucks, buses, car, off-road car, SUVs, and other Vehicles. Specifications: Material:ABS Size:Approx.12.7x3x6cm/5x1.18x2.36inch Color: Black Power supply: DC10V~30V Working temperature:-40C ~+80C. Pitch-angle:-40 ~+40 Rolling angle:-40 ~+40. Voltage-measuring range: DC10V~30V Time-error: < 1 minute Voltage-measurement accuracy: 0.5V Speed accuracy: < 0.36Km/h GPS data refresh-rate: 1s GPS hot start: 1s (average) Wireless transmission frequency: 2.4GHz GPS cold start: 32s (average) Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Car HUD 1x Cigarette-Lighter Power Cable 1x Refitted Power Cable 1x Holder 1x Manual