Perman Electromagnetic Auto Car Safety Parking Reversing Reverse Backup Radar Sensor with Led Buzzer With led display BIBI alarm. Improves parking safety. Detection in all directions without dead angle. Minimize bumper damage. Totally built-in installation without impair overall appearance. Indicates object distance with different beeping frequencies. The sensor antenna activates 3 types of acoustic signals during approaching an obstacle at different distances. A continuous sound of Beep approximately between 0-0.3m. A short interval sound of Beep approximately between 0.3-0.5m. A long interval sound of Beep approximately between 0.5-0.7m. Wires to Reverse Lamp (12 Volts DC). High output Piezo buzzer alert you with a beeping sound. Detects object at 3 feet or less. Detects people, vehicles, small & high kerbs, garage doors, pillars, posts, walls, fences, barriers, skips, etc. Simple and concealed installation. The sensor antenna is entirely installed inside the bumper without any drilling work. Maintenance free, no cleaning or washing is required. Fit for any car, truck, RV or mini-van. Peel & Stick Antenna foil tape sensor for vehicles bumpers.