Preamp Booster PA2 for guitar or bass. Package Includes: Output jack and battery clip set. Mounted on toggle switch with adjustable preset, needs 1 hole. The PA2 is a straight booster preamplifier mounted on a minitoggle switch. Perfect if you want to just plain overdrive the input of your amp for distortion. It has a trim pot so you can preset the amount of boost up to an additional 20 dB. The PA2 will also work with passive pickups.