2 in 1 Smart Car System: GPS HUD & Vehicle Inclinometer Plug & Play: Powers on with the car and turns off when the engine is off. Easy installation: Comes with a car charging cable and works with all vehicles. Speed Unit: Switch freely between KM/H and MPH. Built-in high-precision GPS module with dual-channel satellites. Real-time display of vehicle speed, voltage, attitude, compass, and coordinates. Built-in slope sensor for pitch angle and roll angle measurement. Multiple warning alerts: Over-speed, over-voltage, under-voltage, abnormal altitude, fatigue driving, tilt angle danger, and pitch angle danger alarms. Supports clock and driving speed calibration. Product Parameters: Power Supply: DC 10V ~ 30V Pitch Angle: -40 ~ +40 Time Error: Less than 1 minute Voltage Precision: 0.5V GPS Cold Start Duration: 32 seconds (average) GPS Update Rate: 1 second Dimensions: 127 x 25 x 60mm (L x W x H) Working Temperature: -40C ~ +80C Roll Angle: -40 ~ +40 Voltage Range: DC 10V ~ 30V Speed Precision: < 0.36 km/h GPS Hot Start Duration: 1 second (average) Wireless Transmission Frequency: 2.4 GHz Color: Black Material: ABS Package Contents: 1 x Main unit 1 x Holder 1 x Car charging cable 1 x English user manual Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and monitor differences may cause slight color variations between the product image and the actual item. Measurement error allowed is 1-3 cm.