Soundbrenner Pulse

Charged it and tried it on my wrist while practicing guitar. First of all, the sound from the vibration is quite loud — which surprised me, but also makes sense considering the vibration needs to be clearly felt on the arm.
The second thing I noticed right away is… that it’s extremely loose in timing. It’s basically a metronome that can’t keep the beat. That might make sense if you’re practicing playing along with a bad drummer — otherwise not.
I tried recording the sound from the motor in Pro Tools and lined it up with my grid at the specified tempo, and it’s also clear there that it drifts randomly away from the bar lines and then finds its way back again.
Anyway — in my view, a completely and utterly useless product.