Andoer Piezo Contact Microphone Pickup for Guitar Violin Banjo Mandolin Ukulele (Style 1) A professional Piezo Contact Microphone pickup - 1/4' jack with 31.5" cable. Contact microphones pick up sound by being in direct contact with the sound source. Able to eliminate external sounds interference and not be influenced by sound reflections from nearby objects. Just plug it into your amp, bass amp or other recording equipment. Comes with double sided tape and self adhesive Velcro for multiple mounting options. You can amplify your guitar, mandolin, banjo, violin, ukulele, viola, cello.