Cell Phone Power Bank:Our compact rechargeable USB Portable Power Bank is the ideal promotional product to “eliminate the dead battery drama” while using your mobile phone, camera, or game player. Simply connect your USB cable to the Power Bank, instead of your USB Charger wall plug, to recharge “on the go!” This 2200 mAh power bank will quickly recharge your phone or device battery up to 2 times in as little as one hour. To use, simply plug your device into its standard recharging cable, and plug the open USB into our USB Power Bank. It’s Li-ion Cell recharges fully in about 3 hours time, is rechargeable up to 500 times. Solid Anodized Aluminum case is compact in size (measures a mere 3 ¾” x 7/8” x 7/8”), which makes it ideal for storage in a purse, glove box, auto, or briefcase for emergency use. Each Power Bank features four LED blue lights which indicate remaining power and the status indicator to show percentage of recharge done at a glance.