This lamp is probably only from housing and LED. I could not recognize the optics ensures good light distribution. The light of this lamp is exactly in the middle so that it appears extremely bright so that you can see außenrum almost nothing. The bright spot in the middle is unfortunately so small that you also can not see anything in it. The light distribution is for 20m distance OK. As the bright spot has then namely the right size. However you want with such a mini flashlight yes find a keyhole or something and it is not just suitable. The light is very blue.
This of course comes the coin-cell battery format. One AAA battery would fit on the size and also the almost everyone lying around.
2 stars that the metal is well made and it's very easy.
