1. The radar horizontal angle is nearly 160 degrees, the detection angle is 80 degrees, the effective reporting distance is within 0-3meter, and it can cover the southwest blind spot of the vehicle. 2. Anti-vehicle vibration interference. 3. Not affected by rain, snow and smoke; 4. No wiring is required, easy to install and use, and the position and angle can be easily adjusted according to different styles; 5. When the vehicle is reversing, the radar detection warn in advance to reduce the risk of accidents when the vehicle is reversing. The wireless millimeter wave reversing radar needs to be connected to the reversing light to trigger. No extension line is required, saving installation costs. The radar device is installed at a height of 60-80cm from the ground. If the radar is installed too high, the sensitivity of the low radar be poor. Please adjust the downward angle of the radar device to be or equal to 3-5 degrees. Wireless technical parameters: Frequency band: Sub-1GHz (380Mhz-440Mhz) Air data rate: 0.1 to 10Kbps Output power: +12 dBm maximum Receive current: 18.5 mA @ Transmit current: 35mA @ +12dBm Power supply range: Transmit (12V-28V) Receive (5.02V-28V) Receive sensitivity: .118dBm@ Operating temperature: -20-+ 80 Usage distance: about 20M Modulation: (G) and (G)MSK Frequency hopping: 1200/S Radar technical parameters: Frequency band: 9.9 .10.5GHZ Distance resolution: 0.01m Distance accuracy: 0.1m Detection and alarm distance: Horizontal angle: 165 Vertical angle: 105 Buzzer alarm: 3-2.1M beep suitable for 0.5 seconds 2.0-1.1M slow beep suitable for 3 seconds Below 1M long beep suitable for 5 seconds Colour:Black Material:ABS Package Contents: 1 * Car Millimeter Wave Reversing Radar Sensor 1 * Buzzer Alarm Only the above package content, other products are not included. Note: Light reflection 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.