This laser harp is hand-painted with a 3d-printed body, salvaged from a kalimba 3d (mis)print. Seven lasers are pointed from the top of the instrument to sensors at the bottom. When one of the beams is 'broken', a musical tone is played in whichever of three octaves is selected (low/medium/high). The other button at the bottom plays a demo song. Also includes an on-board speaker (can be turned on/off with switch on the side) and a line out jack with volume knob (for plugging into an amp).