9 months later, and I can't say I'm impressed by these. I had (up until two weeks ago) been using one of these on my keychain. I found that since they lack a lockout feature, I would frequently find them "on" in my pocket. Many times I didn't even notice it, and when I went to use it, the battery was dead. So, unfortunately I can't recommend these. I would be willing to try the Nitecore keychain lights that include the lockout feature, however.