Advice: 1. The speed measurement is fixed. 2. There might be a discrepancy of 1-3 kilometers in speed, which is typical. If this concerns you, please refrain from purchasing.

1. Product Category: Heads-Up Display 2. Composition: ABS and PC 3. Dimensions: 70*42.8*20mm / 2.76*1.69*0.79 inches 4. Power Source: Car USB Port (Input Voltage: DC 5V) 5. Features: Speed Monitoring, Automatic Brightness Adjustment, Easy to Use, Compact Size.

Prior to setting up, ensure you operate your vehicle in open areas rather than in garages or enclosed spaces, and keep your car window open.

2. Connect the USB cable to your vehicle's USB port, and attach the other end to your device; 3. Place it on the dashboard, start your vehicle, and wait for 1-3 minutes. Once '0' shows up, the installation is successful. Apply the reflective film to the glass; 4. Disconnect the cable, and it will power off.