Specifications: 1. Digital LCD showing obstacle distance 2. 4 sensors for rear available 3. Alarm by Bi-Bi sound, 4. Blue color background 5. The simulative vehicle is displayed in the colorized screen 6. Digital signs (Attention, Brake & Stop) will be displayed in the colorized screen 7. All kinds of sensor colors and styles are available 8. High quality and easy to install Technical: 1. Rated Voltage: 12V DC 2. Operating Range: 10.5Ví½ 16V DC 3. Rated Current: 50mAí½ 180mA 4. Detecting Distance: 0.3í½ 2.0m 5. Ultrasonic Frequency: 40KHz 6. Display Working Temperature: -30 í½ +70íµ There are 3 kind of sensor can be used: 1) Normal sensor: SB308-4, SB308-6 ,SB308-8 2)Luminous sensor: SB308F-4, SB308F-6 3)Interchangeable sensor: SB308S-4 , SB308S-8 Packing Details: 1)Carton Size: 460mmX310mmX510mm 2) Quantity: 20 PCS/ CTN 3) G.W.: 14 KG 4) N.W.: 13 KG