SH T-Pro is a 4-band equalizer with automatic, chromatic tuner for acoustic and classical guitar The T-Pro's accurate and stable tuner will take care that you will never play out of tune as it shows note and tune status. When you turn the tuner on it mutes the output signal. With the 4-band equalizer-controls (bass, mid, treble and brilliance) you will be able to adjust your personal, acoustic sound easily. Pressing the EQ-shape (tone controls are in middle position) switch will turn you linear output frequency curve into a V-shape form which means it will boost bass and trebles and cut the mid. Now you can use the tone controls to influence this V-shape sound and create you own personal sound. Notch filter and phase invert switch will keep feedback totally under control. When you turn notch filter knob fully left, notch filter is off. SH T-Pro is completely shielded and therefore 100% hum-free. It comes with an active Nanoflex pickup and an endpin connection. The 9V battery is under the preamp and is easily accessible. The LED will turn on when the battery power is low and battery should be replaced within 30 minutes. Fastening screws are fixed into the plastic plugs - and not into the wood of the instrument. Preamp with integrated, chromatic tuner, 4-band EQ with volume control, EQ-shape, notch filter, phase invert switch, turner on/off switch, incl. Nanoflex pickup, incl. endpin output connector, outer bezel dimensions: 89,0mm x 60,5mm (3.5'' x 2.4''), cutout dimensions: 71,5mm x 52mm (2.8'' x 2.1'').