12 Panasonic CR-2032 lithium batteries sealed in an electrically insulated foil strip ( same material as a Military MRE {meal ready to eat}). This Flexible strip is super light weight (1.4 oz)  and easily folds small to stash in a pocket or pack. Panasonic publishes a 10 year shelf life on this battery.  This is  the same battery strips we provide the military for our LazerBrite Modular light Systems and Kits.

All LazerBrite products are made in the USA.