General: Designed for customers who want audible only systems with 4 sensors installed in bumper

End driveway worries and protect pets, property and loved ones or If you park your car or truck in a tight spot this item is for you.

• When reversing, the 4 rear sensors that are installed on your back bumper send ultrasonic waves to detect obstacles behind vehicle. Then controller receives signal & transmits to Speaker
• The Speaker emits long intermittent beeps at 4-6 feet, and as you move closer obstacle the beep increases in frequency. When you are 1 foot away from obstacle, the sound is continuous
• The Power is supplied by tapping into reverse lights
• This Package Includes: 4x20 mm sensors, controller, drill bit, and owners manual/installation instructions