He put it all together on proto-board, although soldering the FM radio module was a bit tricky. The Arduino code is quite simple, and available for download (zip file).

Figure an Arduino most matches the "Other" category. To be specific, it isn't an Arduino brand, it is a DigiSpark, but the trouble isn't with the device itself. The problem is with a buzzer. I got ...

If you’re bit-less, they’re also now selling an Arduino-centric starter kit with the Arduino module and 8 others (a battery, a few switches, a servo, and a control dial) for $89.