Portable power banks are ideal for charging on the go. Compatible with most smartphones including iPhone and Android as well as tablets. With an on/off switch to indicate when the power is on. When the battery is dead, the power bank will take up to three and a half hours to fully charge. The portable power bank features a micro USB connection, the power bank has 2200mAh with a 5V-1A input and output. Contains an assortment of grey and black colours.