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Return To ShopRydeen Mobile Speed Control for PSR4000 Parking Sensor. Made for PSR4000 and PSK4 Kit. Activates front sensors at speeds 5 MPH and lower. Automatic speed detection by GPS. Adding a switch no longer needed and consumers will not have to worry about turning the system ON when pulling into a parking space in low speed. Also avoids unnecessary alarms when driving on highways. Simple 4 wire hook-up will require power, ground and brake wire connections. An optional part for the PSR4000 digital parking sensor and PSK4 add-on kits when used as front sensors.