1. 2~8 pieces different color sensors is available
2. Alarm volume: 75~90 dB
3. Sensor Detection Range: 0.3m - 2m
4. Sensor can be replaced easily
4. Convenience of installation and service

Specification
1. System detecting obstacle using Ultrasonic Wave Echolocation Technology 
2. Bi Bi Bi Bi Buzzer Warning only No Display
3. Beeping faster if closer to obstacle and continuously if within 0.3m from the obstacle 
4. Designed for cars, suvs, 4x4s, vans, pickups, trucks, RVs, Trailers, and Buses. 
5. Sensor Detection Range: 0.3m - 2m 
6. 4 rear sensors giving good coverage of the rear end of your vehicle when backing up 
7. Each sensor with wedge-shaped plastic spacer for adjusting to non-vertical bumper surface 
8. Perfect for backing up, street parking, parallel parking, garage parking,
and parking in tight spot ... 
9. Powered by tapping into the wires of back up light 
10. Activated when vehicle is put in reverse 
11. High Quality 
12. Competitive Prices 
13. 12 months warranty