Usage Tips:Features: 1. Wide Application: Can work on all cars / trucks / buses / E-scooters / E-bikes, etc. 2. Plug & Play: After connect power supply, it will work directly, no need any other operation. 3. GPS+Beidou Dual Chips: No skip speed, more coherent and smooth display. Speed is very accurate, and the speed is refreshed quickly without any delay. 4. Innovative Design: With sun shine hood itself, good review even under sun. Large font, clearly visible both during the day and at night. Speed unit KM/H and MPH versions are available. 5. Notice: The device is GPS digital speedometer, and speed is collected from satellites. So if tested at home or parking lot, perhaps speed can't display correctly. Please test it on the car outside with good signal. Specification: Material: ABS Product Color: Black Product Size: 80 x 31 x 54mm Product Weight: 200g Satellite Frequency: 1575mhz Input Voltage: DC 12V Working Current: 200-300mA Working Temperature: -25-75 Package Included: 1 x GPS HUD Digital Speedometer 1 x USB Cable