That’s a Soundbrenner Core Steel. It features smart vibrating metronome, contact tuner, db meter and it also works as a smartwatch getting notifications from the phone (if paired). I used it as a metronome, very helpful when live looping and in other contexts. You can get it (or any other soundbrenner model) with a 20% discount using the code BELIBAT20 at checkout: https://soundbrenner.com ;). Source: almost 3 years ago

The Soundbrenner Core gives you a smarter and more reliable set of fundamental music tools in a premium wearable. It serves as your everyday watch plus a 1) vibrating metronome 2) contact tuner 3) dB meter and 4) smartwatch. Learn more on soundbrenner.com. Source: about 3 years ago

Or maybe it'd be like using one of those online beat generators, but instead of dragging over from a fully opened menu you have to unlock them. https://splice.com/sounds/beatmaker or http://sampulator.com/. Source: almost 3 years ago