About this item Turn any 2.25-5V DC power source into a USB charging port • Add a USB charging port to all kinds of electronic devices Get stable 5V output from 3.7V lithium cells over their entire operating voltage range • Also works great with two alkaline or NiMH cells 5.2V 1500mA Peak Output • 1000mA Sustained Output • 500KHz Switching Frequency • Up to 96% conversion efficiency LED Power Indicator • Industrial grade (-40℃ to 85℃) • Solid State Capacitors Size: 28.9×18.8×8.5mm