Well that's a quite simple question. I tried my chance with Google Images without success and tried some lists of images to be able to know what is this component. But I don't find it and there is nothing written on it.

enter image description here

  • \$\begingroup\$ Short Circuits, Volume 1 or 2 or 3 by Jaycar Pty Ltd. \$\endgroup\$
    – Bradman175
    Jul 23 '16 at 10:11

This is Light dependent resistor (LDR).

Its similar to a normal resistor, but the resistance decreases with increasing light intensity.

  • \$\begingroup\$ Perfect! Thank you O.Blue I can put a sticker on it now :) \$\endgroup\$
    – rels
    Feb 20 '16 at 14:19
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    \$\begingroup\$ If the answer seems good to you, don't forget to accept it (button just below the up/down vote arrows). It allows to mark the question as answered \$\endgroup\$
    – MaximGi
    Feb 20 '16 at 14:37
  • 1
    \$\begingroup\$ Possibly worth mentioning that these are generally based on Cadmium Sulfide (CdS), and are therefore not RoHS-compliant (Cadmium is on the no-no list). Use ambient light sensor (the generic term) for plenty of RoHS-compliant options. \$\endgroup\$
    – Calrion
    Feb 21 '16 at 5:57
  • \$\begingroup\$ Do they only work for visible light or can you get ones for ultraviolet, infrared, etc light as well? \$\endgroup\$ Feb 21 '16 at 6:31
  • \$\begingroup\$ @MiximG wanted to do it straightly but had to wait "10 minutes" and had to go, so it's done only now. \$\endgroup\$
    – rels
    Feb 22 '16 at 7:43

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