Does exactly one thing: channel switching, and does it very well. No extra hisses, noiseless on/off function, and you can't break this up but with extreme violence. Remember to buy and extra cable for the connection, since this comes without. (TRS recommended, although I've been using normal instrument cable also without any problems.) This might seem like a downside compared to the ones with fixed cables, but you'll change your mind the first time you have connection issues: with detachable cable there's no soldering, no hassle, just plug the new cable in and continue to rock on. A solid product, well recommended.