Affordable, yet well-made EDC lamp that adapts to the keychain. The lamp is only slightly longer than that required for the operation of AAA battery, so a little longer than a typical house keys. It is switched on by closing the lamp head and light up initially in persevering and weak "Firefly mode" sufficient good to get your bearings, so you can also find the toilet or can read a book without disturbing the adjacent sleeping neighbors. A second switching enables the lamp in the normal mode, then it is quite bright and sufficient as path lighting outdoors. The third turning on switches to the brightest mode; it's amazing what you can now do with quantum physics - the mode sucks the battery in 30 minutes empty, but sometimes you need a really bright light, and that is actually supplied by the dwarf, I would of the luminosity (not focusable ) compared with a Maglite 3D with light bulb, so the top product of the 1990s. If you want a flickering light, the lamp turns six times; because only me nervous flashing modes, I am glad that it can not be accidentally activated. For 16 euros a very useful, inexpensive and also verschenkbarer keychains.