G1 GPS Car HUD Head Up Display GPS + Beidou Digital Speedometer with Overspeed Warning Fatigue Driving Alarm Compass Feature: Applicable to all vehicle models, easy to install, plug and play. Vehicle speed, compass, number of satellites, single travel mileage, speeding alarm, fatigue driving reminder, automatic light sensing, km/h and MPH. Specification: LED color: White, Green (Optional) Function: speed, mileage per trip, direction of travel Alarm: speeding alarm, fatigue driving reminding alarm Language: English, Simplified Chinese, Traditional Chinese Display size: 2.1 Inch Display: white light, green light Weight: 158g Product size: 61.7x63.8x47.1 mm Notice: Our speedometer is based on GPS/Beidou, so it can only be used normally under the condition of satellite link. It generally receives weak signal in the tunnel. It is also affected in places with dense buildings. In the initial stage and the acceleration stage, there will be an error of 1-2 km/h. Note: There may be slight size deviations due to manual measurement, different measuring methods and tools. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Package includes: 1 X HUD 1 X Anti Slip Pad 1 X USB Cable 1 X Manual Packing list 1 X HUD 1 X Anti Slip Pad 1 X USB Cable 1 X Manual