|Description from Amazon USA|
The Silent Brass system lets you play your horn anywhere you want, anytime you want, with just the kind of ambience you want. You can mix in the sounds of a CD player, a Silent Piano, an electronic keyboard or another instrument using the Silent Brass System, and output your playing to a recorder or even an amp with speakers. Never again will you have to search for a practice room or have to stop because it's getting late. The system includes the Silent Brass module, pickup mute, locking cable, belt-loop/strap, button earphones, and 9V battery. The Personal Studio module has been redesigned. It is sleeker, smaller, the sound quality has been improved, noise reduced, and the controls simplified.