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Amazon.com: Guitar Pickup with Volume Control, Piezo Contact Microphone Transducer for Guitar, Mandolin, Banjo, Cello, Kalimba, Harp and Other Stringed Instrument : Musical Instruments
How to Make a Contact Microphone : 4 Steps - Instructables
Contact Mics Contact Microphones Piezoelectronic Transducers Piezo Microphones Weirdo Gadgets Designed by Crank Sturgeon Manufactured by Huso Solutions since 2007