New Old Stock! The original sound modules of Claim Guitars (Germany). Can be activated by a push pot which replaces the tone pot of your instrument. In normal function it works like a standard tone pot. When you pull the pot the sound module is activated and allows some more sound variations. CBM-1 is for a HSS or HS pickup combination and needs a 500kOhm push pot (Important: humbucker must have 4-conductors). Wiring instructions included. No battery required.