Check the listing for details. PRESYS/AERO 101 Guitar Preamp EQ Tuner Piezo Pickup Equalizer System. Condition: New. Listed at 14.69 USD. Features: Volume control Bass Mid Treble control Phase control button Low battery indicator(powered by 9V battery) Build-in tuner Pre-wire Sonicore pickup for solder-free,plug and play installation Low profile control knobs Small footpint For easy access to controls Combined Battery box with preamp Preamp internal size: 46.5mm x 78.5mm (1.83 x 3.08inches) Preamp External size: 81.5mm x 55mm (3.20 x 2.17 inches) Distance between 2 screws on Preamp: 45.3mm x 70.0mm (1.78 x 2.76 inches) Package Including: 1x Aero Acoustic Preamp with Sonicore pickup 1x Audio Jack 4x Mounting Screws for preamp 1x manual 2x mounting brackets 1x Fishman EQ Without Battery!! Features: Volume control Bass Mid Treble control Phase control button Low battery indicator(powered by 9V battery) Build-in tuner Pre-wire Sonicore pickup for solder-free,plug and play installation Low profile control knobs Small footpint For easy access to controls Combined Battery box with preamp Preamp internal size: 46.5mm x 78.5mm (1.83 x 3.08inches) Preamp External size: 81.5mm x 55mm (3.20 x 2.17 inches) Distance between 2 screws on Preamp: 45.3mm x 70.0mm (1.78 x 2.76 inches) Package Including: 1x Aero Acoustic Preamp with Sonicore pickup 1x Audio Jack 4x Mounting Screws for preamp 1x manual 2x mounting brackets 1x Fishman EQ Without Battery!!