ResQBattery - Tiny, Smartphone Battery Pack Will Jumpstart Your Phone (Pack of 2) (Grey) Pre-charged battery pack, effortlessly attaches and plugs in to your phone Thumb-sized and cable free, easily fits into a pocket or small hand bag Charge once or intermittently for up to 5 hours of talk and text, with on/off switch and LED status indicator Safe for the environment, certified and biodegradable material Compatible with smartphones and tablets including the following brands Samsung, LG, Motorola, Sony, Google, Microsoft, Nokia, and HTC (please note, this device is not compatible with Apple).