Features:
1) Display type: digital LED display with Bi-Bi sound
2) Sensor number: 2 - 4pcs
3) Sensor color: black, red, white, silver, green, gold, orange, blue
4) Detector type: drilling or stick-on
5) 2-digital display the distance
6) Activation:
   a) Sensors is activated when reverse gear is engaged. The direction left, middle and right, and obstacle will show on the display by signal
   b) On backing the car, the rear sensors detect obstacles  behind the car automatically
  c) Stage-by-stage sound alarm to avoid colliding; the Bi-Bi sound could be adjusted, with mute setting
7) Versatile detection range
8) Sensor types for optional

Specifications:
1) Working voltage: 12V
2) Input: 4W (max)
3) Beeper: 90 - 105dB
4) Working temperature: -40~+80oC
5) Frequency: 40kHz
6) Best detection distance: 0.5 - 1.5m

Inner packing:
1set/box
Dimensions: 30 x 21 x 6.3cm

Outer packing:
10sets/carton
Carton dimensions: 44 x 32 x 36cm