The Schatten BB-03 "Black Box" adds a volume control to your guitar, without drilling or soldering. The BB-03 is a small lightweight passive volume control unit that simply plugs right into the endpin jack or output jack of your guitar. It is designed to work with any acoustic instrument that has a pickup system that needs a volume control.
Housed in a strong ABS box, the BB-03 Black Box has an extremely rugged design. The BB-03 measures only a scant 2-1/4" x 1-1/4" x 3/4" in size and weighs just 1.5 ounces (42 grams). Simply plug the BB-03 into the output jack of your guitar and plug your guitar cord into the jack on the bottom of the "Black Box". Does not interfere with strap usage.
The BB-03 will work with just about any modern pickup system on the market, no batteries needed. However, some older passive undersaddle pickup designs may not have sufficient output to be used with a passive volume control and are not recommended for use with the BB-03.