Backup power for your cell phone, MP3 player or other mobile electronic device is never out of reach with the RX4-AA from Zap! Leave the rechargeable AA batteries in it and use the RX4-AA as a rechargeable battery pack or an external power source. The RX4-AA will power or charge most cell phones, digital cameras, MP3 players, smart phones, PDAs and Bluetooth devices via the USB out. The unit includes cell phone/Bluetooth power adaptors for Motorola, Nokia, LG, Samsung adn the mini USBB adapter as well. It will power and charge popular electronics like the Blackberry and Palm/Treo. Don't have the charging tip for your electronic device? More tips are available from ZAP! Take out the batteries and you can use them to power your regular household device like a flashlight or a toy. It acts like a AA battery charger. Charge the RX4-AA vias the USB out port on your computer or the supplied AC adapter. The RX4-AA comes with a 100-240V AC adapter for travel around the world. The RX4-AA includes four Ni-MH AA rechargeable batteries. Its stylish small footprint design fits into your purse or pocket. It comes with a leather like carry bag for the power accessories. The ZAP Recharge It ALl battery is an excellent solution for all of your emergency power needs. It acts like a AA battery charger and travel pack to keep your electronics powered and ready for use. Depending upon the power requirements of your cell phone the RX4-AA should fully charge your phone twice.