Description : HTB338 Car reversing aid used to detect potential back obstacles out of view Features: * Suitable with all kinds of vehicles * Double LED display to show exact position and distance of obstacles * LED indicator shows the distances: rear left, rear right * Alarm in four-step sound: bi,bi,bi bi,bibi,biii * Tideproof and acidproof design for wire * Fit for wide temperature * Anti-jamming electronic wave * Avoid wrong message * Reversing vehicle with enhanced safety and convenience * Faster and easier parking, especially in crowded areas * Preventing accidents Specifications: * Rated voltage:10-27V CD * Input: 3.8W (max.) * Operating temperature range: -20 to 70?C * Beep volume: 85DB?DB * Detective range: 0.4- 1.8m * Ultrasonic center frequency: 40KHZ