Gives you extended talk time on your mobile/smart phone?? and can be used while you talk</br>Use a USB charging cable (sold separately) to charge your mobile phone?? MP3 player and more</br>Plug the USB connector into any USB power port?? like the one on your notebook?? to recharge the AAA batteries</br>Remove the re"eable AAA batteries inside and use them to power your wireless mouse or other device</br>Slim?? lightweight design that fits in your pocket.</br></br>Product Description</br></br>A jolt of juice for your mobile phone. When you??re in a crunch?? the Kensington Rechargeable Pocket Booster for Mobile Phones