Mophie Juice Pack for HTC One M7 (2500 mAh) - Black Rechargeable 2500mAh battery extender and protective case in one Doubles the battery life of the HTC One M7-- Up to 270 hours of standby time. An additional 8 hours of talk time on 4G/LTE and additional 6 hours on 3G. Up to 36 hours of additional audio playback. Up to an additional 9 hours of video playback. Sleek and slim soft touch finish Quick recharging speed. Completely recharge your HTC One M7 phone within 1 hour. Pass Thru USB - Included micro USB cable allows you to simultaneously charge and sync your HTC One M7 phone without ever having to remove the phone from the case. Rechargeable 2500mAh battery extender and protective case in one ^Doubles the battery life of the HTC ONE -- Up to 270 hours of standby time. An additional 8 hours of talk time on 4G/LTE and additional 6 hours on 3G. Up to 36 hours of additional audio playback. Up to an additional 9 hours of video playback. ^Sleek and slim soft touch finish ^Quick recharging speed. Completely recharge your HTC phone within 1 hour. ^Pass Thru USB - Included micro USB cable allows you to simultaneously charge and sync your HTC phone without ever having to remove the phone from the case.