Despite being small this UL listed ultra slim power bank can pack a heavy load! This useful and comfortable item can be modified with an imprint (silkscreen or laser engraved) of your company name and logo to maximize brand visibility on a must-have giveaway. It contains a 3000 mAh lithium polymer grade-A non-recycled battery, a USB output and a micro USB input. Output: 5 volts/1 amp. Your device's charging cord is required for use. An excellent product to display your brand on.