Top Dawg P-1410 Premium Wireless Backup Sensor System with LCD Will audibly and visually alert driver if object is behind vehicle within 8ft. Includes 4 in-bumper Sensors for an OEM look/Includes a waterproof controller With waterproof controller, this system can work for large vehicles and RVs and buses (no other system in the US offers a waterproof controller) Reduce backup accidents by 70% or more Includes a WIRELESS receiver that has the built-in speaker/buzzer. This receiver taps power under dash