BOYO VTSR220 Parking Sensors with Waterproof Connector Total 8 Black Rear(4) and Front (4) Parking Sensors with waterproof connector Audible Buzzer with volume adjustment (Off, Low, High)Detective distance from 1.0ft to 5.9ft,Include Metal Bumper Hole Saw,Can be used with any aftermarket monitor and camera that uses standard RCA video plugs Distance readings are shown on monitor