Vics Endpin Jack Pre-amp Piezo Pickup for Acoustic Pickup with Tone and Volume Control This brand new and active endpin pre-amp piezo pickup is ideal for use with any acoustic guitar Active professional tail nail type pick-up do not hurt the harp body free hole with tone & volume control. The 9-volt battery powered electronics are mounted in a small tube that is directly coupled with a high quality endpin jack making an all-in-one, easy to install structure Comes with a battery pouch, the 9V Alkaline battery not Included Soundhole Mounted, Tone and Volume Control