DROK Waterproof DC Buck Converter Parallel to Dual USB Adapter Connectors Voltage Regulator 8-22V 12V to 5V 1A DC Car Power Converter for GPS Navigation, MP3, MP4, Car DVD, Hard Disk Player Module Properties: Synchronous rectification non-isolated BUCK module. Simply connect the input red to positive and black to negative, very easy to use. Has high conversion efficiency, compact design and easy to install. Has over current protection, short-circuit protection and over temperature protection, safe to use. Application: Power supply for LED car display, GPS navigation, MP3, MP4, car DVD, hard disk player, stereo, etc.