Description: - Universal 4 X AA Battery Portable Emergency USB Mobile Phone Charger - It takes 4 x AA Batteries - Four times the portable charging power of single battery emergency chargers. (Batteries Not Included) - The device is opened by simply sliding back the top battery cover. It has an On/Off Button to switch the charger on and off. - Charge Capability depends on Strength and quality of Batteries used. Suitable for Any Device with a USB charging cable. - Tested with Blackberry 9300 from 0% flat to 50% within 45 minutes (with phone off), Using cheap unbranded Alkaline Batteries (So with a good pair of High Powered Rechargeable Batteries, the charge % should be a lot higher.) Specification: For Iphone/ iPod/ Galaxy S2/ HTC/ Blackberry/ other mobile phone Output Interface: USB Type: Travel Output: 5V/500mA Charger dimensions: 80mm (L) x 70mm (W) x 20mm (D) No charging cable is included with this item. (You need to have your own USB cable that fits your specific device) Package Includes: 1 piece mobile battery charger box