Our classic undersaddle ceramic guitar pickup, AG-Series pickups do not require a battery and can be plugged directly into the amp of your choice. AG-Series pickups’ performance can be greatly enhanced with the use of an impedance-matching preamp such as our Platinum Stage, Platinum Pro EQ or Powerjack. AG-Series Passive Undersaddle Pickups feature: Fishman’s piezo crystal passive undersaddle pickup Available in a variety of widths and string spacings for steel and nylon stringed guitars, including classical, 12-string, and ukulele PRO-AGX-094 Powerjack Active Endpin Jack Preamp or Powerjack Onboard Preamp available as optional accessories An impedance matching preamp is recommended, but not required Professional installation recommended nánar