Keeping portable entertainment devices charged has never been easier. There are over 100 million reasons to carry a Quartet Universal AC Charger for iPod and iPhone, Zune, Blackberry and other compatible USB chargeable devices. Just plug in and charge up. Quartet allows you to charge four USB devices at once. No need for multiple, expensive adapters - when Music Power Quartet does the work of FOUR! No Computer required. Charge your USB chargeable devices at home, at work, in your dorm room, at the airport, at your hotel, anywhere and everywhere!