Tenergy 6600mAh (6.6AH) External Charger & Power Bank w/Micro USB Cable (for Mobile Devices) You can use the included USB-Micro USB cable to charge the power bank from USB charger or USB adapter. Comes with blue LED light indicator during charge. Connect Power Bank to iPad, cell phone or digital devices using the USB cable. Simple to use with our 1-touch charge buttonCharge up to 2 devices at one time! Output will be shut off automatically, if there is no load for 10 seconds.