UK-1 makes it simple to reproduce the authentic sound of your ukulele without any modification. Simply slide this piezo pickup onto the tie block and retighten the strings. It is a passive uke pickup that fits most soprano, concert, tenor and baritone ukuleles with a tie block. This passive piezo system is designed to work flawlessly with your favorite acoustic amplifier or preamp. It comes with detachable 1/8" to 1/4" cable.