High Quality Piezo Contact Microphone, Mono Jack 3.5mm, 120cm cable
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Adeline Ad-35 Mini Piezo Pickup Contact Microphone Transducer With 3 Meters Cable For Acoustic Classical Folk Guitar - Guitar Parts & Accessories - AliExpress
Piezo-Kontakt-Mikrofon-Pickup für Gitarre Geige Banjo Mandoline Ukulel U.S. #V | eBay
Piezo contact microphone hi-Z amplifier – low noise version – Richard Mudhar