 It is the Music Maker Feather Wing. It plays back MP3s, WAV files, and it's a MIDI synthesizer. I have a feather, I'm actually just using a feather M0, and then I have my Music Maker Feather Wing, and I have an SD card in it that has three MP3s on it that I placed onto there. And then you can see, I'm just running a one speaker, but you can do two, you can do stereo, you can do a little stereo separation. And this particular Music Maker Feather Wing is really great when you wanna do a compact project that is sort of self-contained and has its own sound source. So it's got the amp, it's got some speakers on it. Great for props, great for cosplay. Here what I've got is my MIDI tester to send out classic UART over the iSquared C Stem-A-Q-T cable to do that. Okay, I'm not much of a finger drummer. It is the Music Maker Feather Wing with built-in amplifier.