1pc Mini Transducer w/ Volume Pickup for Guitar Ukulele Violin Guzheng Erhu Etc Paste mini pickups,fit for guitar,ukulele,violin,guzheng,erhu,and other vocalinstrument Not subject to any environmental interference,can instrument sound fidelity restore The compact,according to ghe instrument at different positions to get the sound you like With volume control ,adjustable volume level can avoid feedback squeal