Unlimited Schumann Resonance Sound Healing Wind ChimeThis listing comes with hangable wind chimes. The Schumann Resonance Sound Healing Wind Chime is tuned to create three 7. 83 Hz binaural tones when the tubes are played together. This frequency is so deep that it can't be perceived naturally. These wind chimes contain three sets of binaural paired chimes. By playing two tubes tuned exactly 7. 83 Hz apart, a third tone equal to that difference will be perceived, created by the microtonal oscillations