 Stema speaker. It is a speaker and amplifier that's super easy plug and play. You can add it to a ton of different microcontroller boards and projects that need a little amp and a speaker. I've got it hooked up right now using one of our Stema to alligator clip cable assemblies and I have it hooked up to a circuit playground blue fruit and I'm running the signal over this audio pin here which on this one is actually PWM but you can use it with boards that have a DAC as well and what I've got are a couple of buttons here that'll give us some sounds and so you can see you get quite a big difference by having that pressed against something which is how these little speakers are meant meant to be used. The Stema speaker breakout board with amplifier.