Give you customers the power back by handing out this slim power bank! Measuring 4 5/8" x 2 5/8" and available in three colors, this handy charging devise is a 4000 mAh lithium polymer grade-A non-recycled battery and features a USB outlet and a micro USB input (cord included). It will charge most devices and requires its charging cord to do so. Output: 5 volts/1 amp. Customize with an imprint (laser engraves are white) of your company name and logo for maximum brand exposure.