Walmart has more info:
http://www.walmart.com/ip/Ritelite-5...i_sku=14264395
Yes it takes AAA batteries. No idea why Amazon is selling that bundle . . .
Oh, the clip. Would you use it? I would just stick the USB end into my PE which would then power the light. Unless you are using the USB port for something else. Or use the lamp and battery pack on a table beside you.