SCHALLER GTR P/U W/EXTERNAL MT Schaller 'Oyster' Model 723 (10/84) Passive Piezo Pickup High Output, No Preamp Needed, No Batteries Required Single Sensor Pickup for Acoustic Guitar and Bass; Also Works on Mandolin, Lute, Dulcimer, Bouzouki, etc. Pre-wired 10 Foot 1/4" Cable with Male Plug, External Mount Made in Germany