If I remember, 3C checks the battery voltage, no need to remember that. 2H, turbo level, that is only on some lights. I don't think mine has it. Park ranger

If I remember, 3C checks the battery voltage, no need to remember that. 2H, turbo level, that is only on some lights. I don't think mine has it. Park ranger should just set level 4 and say click on, click off. Park rangers usually won't lend out expensive lights like this anyway, I'd expect. It is intended for a nerdy user who wants a fancy light. Anyway, you can reprogram the UI any way you like.