Like others have said
Turned itself on when attached to keys in my pocket a no go for a single AAA light
It is a nice little light the tail switch is nice there should be a lockout in the UI
OldScholThat has happened to me several times. I twist the head about 1/8 to 1/4 turn until the light goes out. When you're ready to use the light, just twist it back in place.