Let the Yamaha Silent Brass System become your very own portable, soundproof studio! As you play your instrument using the system, you'll enjoy a full and rich sound in your headphones, no matter how loud you play, while on the outside, you can barely hear a whisper of sound. This amazing technology allows the module, smaller in size than a cassette tape, to be portable enough to attach to your belt or slip into a shirt pocket. Easy-to-use controls allow you adjust volume and echo settings, and there's even an auxiliary jack so you could plug in sound from another audio source and play along! Previous generations of brass mute systems had so many features, that there was a serious learning curve involved in using them. But, not so with this new and improved model. It's redesigned format is easy enough to be used by students and techno-phobes as well! Just imagine how this could enhance your lessons and rehearsals, as a student could work on a troublesome part without having to leave the room! In group or private study, the Silent Brass System could easily become a valuable tool in helping your students reach their potential. You'll need the module, which is powered by a 9-volt battery, to run any of the various instrument systems. Optional accessories such as the power adapter, earphones, and carrying cases are also available.