Speed Slope Meter Inclinometer Car Compass for Self-driving Off-road Activities g20242860852 f74 Features: The for smart GPS horizaontal speedometer for driving, fully supports high-precision monitoring of car speed, vehicle tilt/patch angle, car battery voltage status and so on, to ensure your driving safety. Adopts color HD- LCD display with high resolution, and adjust the brightness of the screen by using the sensitivity of the light sensor. Accurate display of vehicle tilt/patch angle changes, when the angle is over 40, the alarm alerts to insure your safety. And fatigue driving alarm alerts after driving for 4 hours. After connected to power supply, there will be backlight inside, which will help you see precisely in for case of night or dark situation. Widely fits for cars, trucks, van, buses and other vehicles and suitable for self-driving and off-road activities. Specifications: Material:ABS Size: Approx. 17 x 6.8 x 6 for cm / 6.7 x 2.7 x 2.4 inches Note: Please allow 1-2cm errors due to manual measurement. Because of the different display of each computer, the pictures may not reflect the actual color of the item. Package includes: 1 Piece for Smart GPS Slope Meter