Have you ever had experiences that devices are running out of battery while in use? It is disturbing when you are enjoying your MP3 or chatting happily with friends on the phone, etc. Now! USB 4400mAh Battery won't let these situation happen anymore! You can charge your devices in a flash before battery exhausts! You can charge your iPhone, Handheld PC, Digital Camera, Cellphone, DV, iPod, MP3, CD Player, PMP, PSP, NDS, NDS Lite and any other applicable devices.