The Prefix Plus-T features ultra-quiet electronics and Volume, Bass, Treble and semi-parametric Contour controls. The Prefix Plus-T also offers a Brilliance control, Phase switch and Notch filter to help fight feedback. In addition, the built-in chromatic tuner can be used without plugging in the guitar. PREFIX PLUS-T FEATURES & INFO WIDE FORMAT: PRO-MAT-PT4 NARROW FORMAT: PRO-MAN-PT4 Fishman quality, reliability and performance Volume control as well as Bass, Treble, Brilliance control, and a wide-range semi-parametric EQ to isolate certain frequencies, and boost or cut them as needed Feedback-fighting Notch filter and Phase switch Onboard chromatic tuner can be used without plugging in the guitar Brilliance slider Low battery indicator Unique pivot design for instant 9-volt battery access System includes an Acoustic Matrix Undersaddle Pickup and Switchjack Stereo Endpin Jack Pickup available in wide, narrow or split formats Professional installation is recommended SPECS DIMENSIONS: 2.46" W x 4.02" H (62.5 mm) (102.25 mm) WIDE FORMAT WIDTH: 1/8" (3.2 mm) width NARROW FORMAT: 3/32" (2.3 mm) width BATTERY: 9-volt BATTERY LIFE: 150 hours