The Thorfire TK01 is a keychain sized flashlight that uses a single AAA battery. Unlike a lot of other keychain flashlights, the Thorfire TK01 is a single output of 85 lumens.
Upon opening the box first impressions were good. The flashlight came with a small keychain ring which slips through a hole in the tailcap, and a couple of extra o-rings. The o-rings are for the tailcap which unscrews, while the bezel does not.
When the Thorfire TK01 housing was opened to insert the AAA battery, the spring typically found in the tailcap had came loose and fell into the battery compartment. It took a little bit, but the spring was finally snapped back into place in the tailcap.
Turning the Thorfire TK01 on and off is as simple as twisting the head. The problem is, the head is very easy to twist. Also, when the head reaches a certain point on the twist, pushing on the head will turn the flashlight on. While carrying the Thorfire TK01 flashlight in my pocket I noticed it turned on several times.