1. 2 in 1 Smart Car Safety System: GPS HUD & Vehicle Inclinometer2. Plug & Play: Start with the car and turn off with car's engine off.3. Easy installation: with car charging cable, can work on all vehicles.4. Speed Unit:KM/H & MPH Switch freely.5. Built-in high-precision GPS module with dual-channel satellites. Real-time display car's Speed,Voltage, also Attitude, Compass, Coordinates...Built-in Slope Sensor: for pitching angle, roll angle measurement.Different alarms: over-speed, over/high voltage, abnormal altitude, Fatigue driving, Tilt Angle Danger alarm, Pitch Angle Danger Alarm;Support Clock & Driving speed calibrationProduct Parameters:Power Supply: DC 10V ~ 30VPitch Angle: -40~ +40Time Error: less than 1minuteVoltage Precision: 0.5VGPS Cold Start Duration: 32s( Average)GPS Update Rate: 1SDimension: 127x25x60mm (L x W x H)Working Temperature: -40 +80Roll Angle: -40~ +40Voltage Range: DC 10V ~ 30VSpeed Precision: less than 0.36Km/hGPS Hot Start Duration: 1s(Average)Wireless Transmission Frequency: 2.4GHzcolour: blackMaterial: ABSPackage Contents:1 x Main host1 x Holder1 x car charging cable1 x English manualOnly the above package content, other products are not included.Note: Light 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.