This Thunderdog TD5017BB Universal 5000mAh Power Bank With Built-In Belt Clip can provide 3 full power refills* for most smartphones, games, cameras, e-readers, MP3 players, GPS, and other 5V devices. Use this Power Bank to re-charge your devices while on-the-go, or to simply provide many extra hours of talk time or entertainment. Dual USB Outputs means that you can charge 2 devices at the same time. The Intelligent Thermal Protection, and 6 additional protection circuits, allow for safe worry-free recharging for your device and the Power Bank. Use the built-in clip to easily attach the power bank to a belt, backpack strap, seat pocket, and more.