Car Reverse Radar System with 4 Sensors 0.3 to 2.0m Detection Range Light Sound Warning LED Display Backup Radar Parking Assistance Kit for SUV Truck Blue Item Type: Car Reverse Radar System Material: ABS Sensor Quantity: 4 Sensor Diameter: Approx. 22mm / 0.9in Sensor Direction: X, Y, 60 degrees Sensor Installation: Drilling Hole Detection Distance: Approx. 0.3 ~ 2m / 1 ~ 6.6ft Beep Sound: Three level heartbeat sound Buzzer Volume: 65dB Sound Frequency: 1.6 ~ 2m / 5.2 ~ 6.6ft/0.5Hz (Slow), 1.1 ~ 1.5m / 3.6 ~ 4.9ft/1Hz (Slow), 0.6 ~ 1m / 2 ~ 3.3ft/3Hz (Urgent), 0 ~ 0.4m / 0 ~ 1.3ft (Continuous) Display: Two digit display distance, colored warning light Display Cable Length: Approx. 5m / 16.4ft Sensor Cable Length: Approx. 2.5m / 8.2ft