2 in 1 Smart Car Safety System: GPS HUD & Vehicle Inclinometer Plug & Play: Powers on with the car and turns off when the engine is off Easy installation: Comes with car charging cable, compatible with all vehicles Speed Unit: Switch freely between KM/H and MPH Built-in high-precision GPS module with dual-channel satellite support Real-time display of vehicle speed, voltage, attitude, compass, and coordinates Built-in slope sensor for pitch and roll angle measurement Multiple safety alarms: Over-speed, over-voltage, under-voltage, abnormal altitude, fatigue driving, tilt angle danger, pitch angle danger Supports clock and driving speed calibration Product Parameters: Power Supply: DC 10V ~ 30V Pitch Angle Range: -40 to +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 to +80C Roll Angle Range: -40 to +40 Voltage Range: DC 10V ~ 30V Speed Precision: Less than 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 Manual Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.