Artec brand AB 2 Active booster for piezo pickup
AB 2 is volume&tone booster for piezo pickup,it is made up of two slide potentiometers with tmetal top panel.it is easily mounted on the side of your guitar.AB2"S tone controls to boost the resonance to achieve pure natural acoustic sound while other ordinary tone controls to reduce the treble band range.Artec guarantees a virtually noiseless soud with long 9V battery life.