Innergie PocketCell Duo 6800 mAh 2 Port (2.1 Amp) Rechargeable Battery Bank w/ Magic Cable Trio World's smallest 6800 mAh rechargeable portable battery in its class Capable of fully charging a tablet once or a smartphone up to four times on a single charge. Can also extend tablet power for up to 7 hours or a smartphone for up to 30 hours. Includes the Magic Cable Trio with integrated 3-in-1 Apple 30-pin, plus Micro and Mini USB connectors, which allows connectivity to over 10,000 different devices with a single cable. Features smart charging intelligence that detects connected device's power requirements to deliver the right amount of power to charge portable products Recharging the Pocket Cell Duo is simple; the Magic Cable Trio Micro USB tip connects to the Micro USB charging port on the Pocket Cell Duo and can be charged from any laptop or computer USB port