Thank you for viewing. This easy-to-use, compact unit offers operability, performance, and quality, featuring volume, bass, middle, and treble adjustment functions, a phase switch, and a built-in tuner with an LED display. It also boasts a pre-wired Fishman Sonicore pickup, easy installation, a battery depletion indicator, low-profile adjustment knobs, and a convenient pivot design for the battery compartment. FISHMAN Presys Blend 301 Designed to fit a wide range of guitars Volume, bass, middle, and treble adjustment functions Built-in tuner with LED display Phase switch Battery depletion indicator 9V power supply with an easy-to-use pivot design Pre-wired, solderless, easy-to-install Fishman Sonicore pickup Low-profile adjustment knobs Brand: FISHMAN Model: PRO-PSY-201 Size: 55.8mm x 84.2mm Power: 9V battery Thank you for viewing.