Certification:NONE Origin:Mainland China Automatically monitor the driving condition of the vehicle. The light intensity induced by the light source sensor is used to adjust the brightness of the screen. The free rotation is used, and its sensitivity is high. Using color high definition liquid crystal screen display, high resolution Power: DC 10V ~ 30V Voltage Accuracy: 0.5V Speed Accuracy: Less than 0.36Km/h Fault Code: Synchronized Vehicle Data Colour:black Material:ABS Package Contents: 1 x Overspeed Alarm Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.