Music Power 0900-72 ENCORE is a rechargeable extended battery for your iPod, Zune, MP3 player and many other USB chargeable devices and it's dual port USB AC Charger. Two power sources in one, the portable power you need for your busy lifestyle. Includes extended play rechargeable LiPO battery-Pack providing two times the run time. Dual port USB charger enables two devices to be charged at once. The ultimate power source for keeping the music and video playing. USB charging cables not included.