The light intensity / brightness was not as much as I expected by reading the explanatory note. (Exaggerated to write too much?) A good point is compact so it will not get in the way even if you put it in the pen insertion of work clothes or an apple. (The pen light which used two AA batteries used before was a feeling that the elbow part caught when the arm was bent.) The difficulty is that the clip part is close to the center, so if you store it in the pen insertion, the tip goes out It is disturbing and disturbing.
I was looking for a light to stab a portion of the work clothes where most of the pen was inserted. First of all, three AAA shapes do not stick. If it is two, it feels long or heavy. Button batteries got dissatisfied because it got dark soon. This product fits perfectly with a pen pen, lightly presses the end by pushing the switch, so you can operate with one hand. It always has a lightweight and does not make me suffering, so it's super convenient at the moment that "Ah! It is dark and I can not see the back". Since it is lit by the boost circuit, the brightness is also stable to the end. One LED can not illuminate a wide area, but it is a super convenient light for inspection and repair which is always gently by side. The color tone is a bit bluish. People who like yellowish things may be interested. Since the guarantee does not work easily as turning the lens, the guarantee does not work, accident / failure is self-responsibility, but changing to the favorite 5 mm LED can be done by soldering.