The item is a professional and practical DC-DC adjustable power supply module, which applies to 9-20V power source, With doubling PCB board, increasing width of the board to insure the current flow more smoothly. One of the four USB interfaces reserving the divider resistance for your DIY. Purpose: All 5V equipment, below 30W electrical equipment such as MP3, MP4, MP5, mobilephone, pad, GPS, automobile data recorder and device, can be used at the same time or can be used LED power supply. Features - - Shell material: durable platic, metal. - Output: 5V, within input range(9V-20V) - Current: 6A. - Efficiency: 94%. - Size: Approx 4.8 * 3.9 * 2.4cm / 1.9 * 1.53 * 0.95 inch. - Core components: -055L packaging, tps40057 chip. - With high frequency low resistance electrolytic capacitors, withstanding high voltage, high stability. - With doubling PCB board, Increasing width of the board to insure the current flow more smoothly. - One of the four USB interfaces reserving the divider resistance for your DIY. - Purpose: All 5V equipment, below 30W electrical equipment such as MP3, MP4, MP5, mobilephone, pad, GPS, automobile data recorder and device, can be used at the same time or can be used LED power supply. Package list: 3 * DC 9V 12V 18V 20V to 5V Power Module with 4 USB Ports