I’ve decided to redo the review in English to reach a broader audience – and because many existing reviews are outdated based on the older model with a charging tray. In the meantime, Soundbrenner has made many updates to the software – you can turn the sound and/or the light on or off – you can change the strength and format of the trill – overall, the company listens to the users and addresses shortcoming. But there are drawbacks as well:
1) the phone application does not work on older Android versions (check in Google Play before you order – or you have to get a new phone too)
2) the charging tray has been replaced by a charging cable that magnetically attached to the Soundbrenner Pulse unit. Unfortunately the cable is a bit stiff and detaches easily. Both not big issues as long as you are aware of them. I wear my Soundbrenner Pulse (on my right ankle) using a self-made construct from a 45mm O-ring and a rubber band because I find that more comfortable than the supplied plastic “wrist watch style” band.
From a guitar practice point of view, the Soundbrenner Pulse works fine for me – but maybe not for everyone. I get more distracted by the sound (or the light) of a Metronome and the trill is perfect for me. Another thing to mention us customer support – when I “complained” about the stiff charger cable, I got an immediate reaction from Soundbrenner asking what the problem – looks like they are rally caring what their customers want. I was looking for something like this for some time and I like what I got.