Car Reverse Parking Radar 4 Sensors Beep Digital Car Parking Sensor Rear Reversing Radar Red Item Type: Car Parking Radar Material: ABS Working Voltage: DC 9V-15V Rated Voltage: DC 12V Number of Sensors: 4 Sensor Diameter: Approx. 22mm / 0.87in Sensor Direction: X, Y, 60 Degrees Sensor Installation Method: Drilling Detection Distance: Approx. 0.3-2.0m / 0.98-6.56ft Alert Sound: bibi 3 Level Heartbeat Alert Sound Buzzer Volume: 65dB Sound Frequency: 1.6-2.0m/0.5Hz (Slow), 1.1-1.5m/1Hz (Slow), 0.6-1.0m/3Hz (Rapid), 0-0.4m (Constant) Display Method: 2 Digit Display Distance, 7 Color Light Bar Display Direction Display Cable Length: Approx. 5m / 16.4ft Sensor Cable Length: Approx. 2.5m / 8.2ft