M-Edge Microsoft Surface 3 Sneak Power Microfiber Leather 2" high 9" wide Slim design - battery adds minimal thickness to case. GripTrack: Enhanced technology allows for numerous stand angles. 6000 mAh charging capacity for your tablet or smartphone. Gives your Surface 3 up to 10 hours of additional battery life and most phones up to 40 hours. LED indicator lets you know how much battery life is remaining. Auto shut-off when battery charging is complete.