Power to go! Don't worry about a flat battery any longer. This is easily possible with this power bank. The small battery has a capacity of 4.000 mAh, which is enough for charging all current smartphones completely. Via the supplied USB cable the battery can easily be charged at the PC and via the USB connection all current charging cables of the smartphones or tablets can be used to charge them. We will engrave your advertising on one side. Single-packed in box.