Take your apocalyptic hymnal writing to the next level with this single piezo disc electric thumb piano. Featuring four springs 5 keys, a chain, volume knob, and 1/4" output. Additional springs and tines are provided to make your own custom setup. Case dimensions: L 4.7" x W 3.7" x H 1.34"

Demo Video:
https://youtu.be/7nPvWp12g3c