An even 12 at the moment, but that'll change next Batteryjunction order... One on each car and truck keychain, two on my dresser at the moment, my stepdaughter and son each have one, and six put away for a rainy day. Too good not to have everywhere. TyJo's comments are spot on, and some steel wool cleans the beam up nicely. I've beat the absolute holy heck out of the one that's still on my keys, and have complete faith in it's ability to make light whenever I twist it on. Recent power outage here once again proved the utility of the EO1, from nightlight to trusted EDC. :)