DigiPower Re-Charge "On the Go" Rechargeable Battery for Mobile Phones. Features a 5000mAh battery with built-in iPhone (30-pin) and Micro USB cables. It is compatible with iPhone 4S, iPhone 4, iPhone 3GS, iPhone 3G, iPod touch (2nd, 3rd and 4th generation), iPod nano (4th, 5th and 6th generation); and also works with Blackberry, Android and Windows phones.