Everything you need to know about Speakers.
These little Piezo speakers are a great and fun addition to any keyboard.
You can use them to play click sounds per key press, or play melodies on startup / shutdown of you keeb - please check the QMK docs for a full guide with examples.
One more advanced feature is outputting MIDI.
They’re really easy to solder. You just have to solder the two exposed legs to the pads on the PCB (like soldering kailh hotswap sockets) orientation does not matter.
Feel free to check out the general soldering advice here.