Turn any 2.6-5.5V 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 Up to 3A input current 5V 2A Sustained Output 1.2MHz Switching Frequency Up to 93% conversion efficiency LED Power Indicator Industrial grade (-40 to +85) Over current protection thermal protection Size: 20x20x6.8mm