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 with car charging cable; compatible with all vehicles Speed Unit: KM/H with free switching option 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/high voltage, abnormal altitude, fatigue driving, tilt angle danger, and pitch angle danger Supports clock and driving speed calibration Product Parameters: Power Supply: DC 10V ~ 30V Pitch Angle: -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: -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: Light and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.