Dual signal system couples the Baggs "element" undersaddle pickup with an internal microphone. The two signals are routed through an internal preamp-mixer to a standard endpin jack, and controlled with a soundhole mounted control unit for mix levels and volume. System is powered by an internally mounted 9V-battery. The undersaddle "element" fits both 1/8" and 3/32" saddle widths. Professional installation very highly recommended.