All I can say is wow! I haven't bought a light in a few years and can't believe how far they have come...I've had an ARC turquoise on my keychain for the past 6 years and now I'm giving it to my wife for her keychain....but I think I'll use the clip on the ITP...as nice as it is, I don't think it would stand up to the same abuse as the Arc since it has a lens cover and the Arc bulb is nicely protected by it's depth..either way, I'm very happy...but now I'm thinking of something a little bigger...maybe a AA since this light is so small, I might lose it if it isn't on my keys...I think I got the bug...