These redesigned propellers have a new aerodynamic shape. When used with the Phantom 4 Pro V2.0, up to 4dB (60%) of aircraft noise is lowered during takeoff and landing. Noise reduction is also enhanced when used with the Phantom 4 Pro, but not as much. This creates a reduction in up to 4dB, equivalent to 60%, in noise during take off and landing. To get the best results, you'll need to fly using the Phantom 4 Pro V2, but the original Phantom 4 Pro will also benefit from reduced sound.