4-5v power source. I've been running one of them off a LiPo battery pack, the one on my tree uses an iPhone charger and a chopped up USB cable.. 
a 4 AA battery holder works well with NiMH batteries in it, too.
4-5v power source. I've been running one of them off a LiPo battery pack, the one on my tree uses an iPhone charger and a chopped up USB cable.. a 4 AA battery holder works well with NiMH batteries in it, too.