374443 Small and exquisite， alarm works for all weather. Indicates object distance with different beeping frequencies. The sensor antenna activates different types of acoustic， the closer， the more rapid alarm sounds to avoid collision. Dynamic display， accurate detection of distance. Small size monitor， easy to install. Highly sensitive detector， clearly and accurately detecte obstacles from rear distance. Model: C1 Colour: Black Dimensions: 7x6x2.7cm Length of cable: About 3.8M Length of sensing line: About 1.3M Technical Parameters: Operating Voltage: DC 9~16V Operating temperature: -40~ + 80°C Input power: < 4W Siren SPL: 70~90dB Operations: please refer to the instructions! 4 sensor system with audible buzzer Anti-false alert technology Self-test function All weather design 1x Alarm 1x Connection Box 4x Buzzers 4x Cables 1x Strap 1x Double-sided adhesive 1x English manual Original box packaging!