Even unlit, they look fantastic: all of the colors have a crystal translucent glossy look. As

noted they have two surface mount LEDs with resistors built in, buried in the button

body. Next to the switch contacts are two additional contacts for powering/controlling

the LEDs. The two LEDs are connected in parallel with ~1K resistors each, so you can

power the LED from a microcontroller pin or direct from 5V (say USB) with 10mA draw.

You can go down to 3.3V power, only 2mA per button, but they'll be dimmer.

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TECHNICAL DETAILS

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Supply Voltage: 5V

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Weight: 10.3g

https://www.adafruit.com/product/3433 1-9-18