It is a 4-sensor rear parking assist system with digital sensors. The system is easy to install￡? stable and simple to operate with high quality buzzer and the detection range is up to 1.5 meters. Equipped with four digital sensors￡? it can provide you with the most accurate information in the quickest way. The self-test function will assure the system is working properly once the reverse gear is selected. <br><br><strong>Features:</strong> <br>4 rear digital sensor system with audible warning. <br>Compatible with tow bar or spare type. <br>Self-test function. <br>Perfect performance under heavy rain￡? windy and dusty environments. <br>Anti-interference and anti-false alert technology. <br>Detachable sensors with waterproof wire connectors. <br>Organized wires in one loom for easy installation. <br>Suitable for plastic and metal bumpers. <br>All weather design.(-40??~ 70??￡? <br><br><strong>Specifications:</strong> <br>Brand: Steelmate <br>Model: PD400 <br>Operating voltage: 9-16V <br>Operating current: !#!lt!*!100mA <br>Detection range: 0.1m - 1.5m <br>Beep volume: 80dB <br>Package size: 23.5 * 14 * 5.5cm / 9.3 * 5.5 * 2.2in <br>Package weight: 540g / 14oz <br><br><strong>Package List:</strong> <br>1 * ECU <br>1 * Buzzer Speaker <br>4 * Sensors <br>1 * Power Harness <br>1 * Set of Installation Accessory <br>1 * User Manual