I bought a pair of these to build an Arduino based scoring, serving and fun ping pong device (don't ask!). These are "score buttons" and they work great as they are easy to use and have nice big buttons. Two cons: (1) The included LEDs suck. No wonder they put six parts on two buttons. Of the six, one works, one flickers, and the rest is DOA. I need to rewire the LEDs and replace them with real ones from my local electronics store. (2) No documents. I have a voltmeter so I was able to figure out the connections but there's nothing in there, nothing about switches and lamps and nothing about LEDs (like voltage). Yes, I saw from the reviews that the LEDs are 5V, but will the circuit or instruction damage them? . Finally, the LED that worked is so dim at 5V that it barely illuminates the button. So: a great button, incomplete instructions and LEDs.
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