Openrun vibration is 30 degree tilted against face, this allows more bass dynamic range and less vibration feelings. The vibration in human voice range and a little higher is purer with smooth frequency response curve that OpenRun is comparable or even excels traditional earbuds. OpenRun removed the LeakSlayer holes on the Air and made the headphone water proof and aesthetically pleasing. It also reduced the leakage by 50% compared to Air.