Parking Assist with Digital LED Display, 6 Backup Sensors (2 Front/4 Rear Drill-in Black, special extended wires to about 20 feet) (SD6) 2 front/4 rear drill-in sensors in black Digital wire LED read-out shows the distance in feet with sound Sound alarm changes base on the distance It shows the front distance of an object when your car is forwarding. The rear sensors are actived when the car is backup