Product Introduction
The audible only backup parking sensor system alerts the driver to the distance of obstacles behind the vehicle while reversing. It comprises of 4 sensors, a central control processor and a buzzer. The buzzer produces on audible warning inside the vehicle.

How it Works
• When reversing, the 4 rear sensors that are installed on back bumper send ultrasonic waves that detect obstacles behind vehicle. If an obstical is detected, the controller receives the signal and transmits it to the speaker
• The speaker emits long intermittent beeps inside the vehicle at 4-6 feet, and as you move closer to the obstacle, the beep increases in frequency. When you are 1 foot away from obstacle, the sound is continuous
• Power is supplied by tapping into reverse lights which means that the device is only on when you are in reverse.

Features
1. Accurate measurement
2. High sensitivity, wide detection range and small blind area.
3. sound alarm
4. Apply to most cars and be easy of installation.

Specifications
1. Operate voltage: DC 12V
2. Power consumption: 3.5W
3. Operate temperature: -20°C ~ +60°C
4. Detection distance: 1.5 ~ 6 feet

INCLUDED IN PACKAGE
• 4 22 mm sensors,, controller, drill bit, and owners manual/installation instructions