Hey guys! This is a simple single pole double throw (SPST) switch. If you connect the brass-colored clip to ground, the LED will work. You don't have to connect it if you don't want to. As others have pointed out, the "on" switch position is behind the other switches. You would expect the light to be on when the LED is off, but that's not how this switch works. This can be clearly seen in the photos. Another reviewer explained how to change the switch, which I did. This takes some patience and skill, but you can flip the switch and the switch will work as expected. Just make sure you rotate the inside 180ยฐ to match the LED to the front cover. You'll understand this better if you remove the top. I think Revain sells them in a pack of three (for a higher price per derailleur), but at $0.50 each, that's a decent price. I have no idea how long they will last as the lugs the switch spins on are very thin and the metal is very thin tin. I certainly wouldn't classify them as a high quality switch that will last the next 15 years. Quite typical for foreign "cheap" but inexpensive goods. I'd say you're probably better off just buying a good quality switch if you really want something to last. I paid more than the asking price for all of this for a good quality switch. For hobby projects that aren't meant to last long or will be used occasionally, I suspect this is a reasonable price. I don't think they deserve more than a few stars because of the quality and also because they are backwards and need modification to work as you would expect.
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