Really good - two things that could be even better

What you should consider when the K3: it is quite small and the keyring because deceives this photo.

A star I subtract but because it is operated with 4 button cells (AR13). That's not quite environmentally friendly and more expensive than "normal" batteries. Sure, there are the AR13 also NoName cheap, but who not always the full power as brand button cells. In addition, I found the onset of button cells awkward and fiddly. And this button cells you do not get time just at any kiosk (on holiday / traveling bad).

What also bothers me is the Anschaltknopf behind the lamp. The is small and has a low pressure point. Whether the size of the lamp it is almost impossible to use with one hand. Only recently light operation without locking can be quite useful.

But otherwise a top flashlight!