The swing series are a unique model with a structure very similar to the lever model. The difference between the two models is that in the swing series rotation of the cylinder depends on winding up the machine, bringing the joy of listening to music for a selected period of time.
The key is placed on the screw on top of the winding and turned counter-clockwise. The energy saved in the spring turns the gears which transfer the energy to induce a steady movement in the cylinder. Music is played when the cylinder plucks the teeth of the metal comb.
Play and pause can be controlled by the button on the device.