Specifications: 1. Wireless CPU to display communications, there are not any wire between the main board and the display. The distance is around 12 meter. 2. Digital LED showing obstacle distance 3. Alarm by Bi-Bi sound 4. LED display with three colors (Red, yellow & green) 5. Crescent shape digital display screen 6. Equip the changeable color LED sensor, 7. Turn on/off the voice according to your desire 8. All kinds of sensor colors and styles are available 9. High quality and easy to install Packing Details: Carton Size: 46 X31 X51cm Quantity: 20 PCS/ CTN G.W.: 14 KG N.W.: 13.2KG Technical Parameters: Rated Voltage: 12V DC Rated Current: 50mA to 180mA Detecting Distance: 0.3 to 2.0m Ultrasonic Frequency: 40KHz HF Frequency: 315MHz Display Working Temperature: -30 to +70 Centigrade