Veho Pebble Verto 3,700 mAh Portable Rechargeable Power Bank for Smartphones, Apple iPhone, Samsung, LG, HTC, Nokia, Android, USB Powered Devices - Grey (VPP-201-CG) Will charge most popular mobile devices including Smartphones, Blackberry, Samsung, Nokia, Sony, gaming and USB charged devices Mini credit card sized portable design with included neoprene carry case. Perfect for handbag or pocket (3.5in x 2.5in x 0.5in) Auto shutoff mode to protect against short circuit, over-current, over-charging and over-discharging Powerful 3700mAh portable battery charger (up to 1000 extra standby hours or 90 hrs.' extra music playback) Just over 2 1/2 full charges of most Smartphones