Chromo Inc.&reg; HTC ONE (M7) 2013 Backup Battery External Rechargeable Full Protection Case - Black (Updated Version December 2013) Fully protective matte rechargeable battery case On/Off switch for easy control Capacity: 2,200mAh, Input: 5V/800mA, Output: 5V/500mA Easy Access to all Functions, Controls, Speakers and Cameras Updated More Secure Fit