Wide Vehicle Compatibility : Supports 12-24V DC, suitable for large vehicles like semi-trailers, trucks, buses, campers. DVR Recording : 7-inch LCD monitor with built-in DVR, enabling local playback and loop recording. Quad View Display : 4 split 1080p monitors for front, rear, and side views, reducing blind spots. IP69 Waterproof : High-level sealing technology, safe in various weather conditions and temperatures (-4? 149?). Easy Installation : Wired system for reliable signal, simple power cord connection, and straightforward camera setup. Enhanced Night Vision : Infrared LED lights for clear visibility at night, 170-degree wide viewing angle for safety.