Specifications: 1. Wireless cpu to display communications, there are not any wire between the main board and the display. 2. Digital led showing obstacle distance 3. Alarm by bi-bi sound 4. Led display with three colors (red, yellow & green) 5. Car rearview mirror with hands free car kit 6. Record and play function for call 7. All kinds of sensor colors and styles are available 8. High quality and easy to install Packing details: Carton size: 460mmx310mmx510mm Quantity: 12 pcs/ ctn G.W.: 16 kg N.W.: 14.8kg Technical parameters: Rated voltage: 12v dc Rated current: 50maí½ 180ma Detecting distance: 0.3í½ 2.0m Ultrasonic frequency: 40khz Hf frequency: 315mhz Display working temperature: -30 í½ +70íµ