Electronic active unit used on the Clapton Signature Series. Offers up to 25dB of variable mid-boost for extra hot output when you need it. TBX tone control pot is included for added tone-shaping power. Ultimate output and control for tone-hungry players. For all passive Strat pickups. Kit includes: Mid-Boost circuit, TBX control pot, 2x standard CTS pots, stereo jack, and wiring diagram.