4x Car Parking Sensors Auto Rear Reverse Audio Buzzer Alarm Radar Detector Kit

4 x Parking Sensors with 2.5M Line. The closer the obstacles, the louder and faster the sound alert. Indicator size: 5.3x 2.3cm. Sensor size: 1.9 x 2.5cm (H x D). Anti-freeze and rain proof. A saw drill head included.