I purchased this for two reasons. First, volume. I play saxophone and the volume of my Boss DB-60 doesn't quite cut it. Second, size. I kept on losing my DB-60. This is hard to miss........I read a number of reviews prior to purchase. It is a clockwork mechanism, and can be over wound. I timed the unit at 80 bpm, you get about 10-12 minutes on winding. Hope this helps
Rating: [5 of 5 Stars!]