Fishman POWERCHIP for Powerbridge (Standard Pot Length)The Powerchip (standard pot length) from Fishman is a piezo volume control designed to offer pickup mixing control when used in guitars outfitted with the Fishman Powerbridge. It brings the capability to mix signals from the Fishman Powerbridge and magnetic pickups. The Powerchip works with Fishmans Smart Switch circuit to automatically split signal into stereo or sum to mono depending on the type of cable used. It requires a 9V battery installation