The StressEraser is state-of-the-art medical technology – portable, drug-free and non-invasive. The premise behind StressEraser stress relief is simple and has been used in practice by physicians, psychologists and meditation experts for more than three decades.We all know that slowing down your breathing can slow down your heart rate and help you relax. The StressEraser cues you to not only slow your breathing but, just as importantly, to synchronize your inhales and exhales with the natural cycle of your heart rate. Here's how it works:From beat to beat, your heart rate naturally increases and decreases in a cycle, known as HRV, or Heart Rate Variability. Using a harmless infrared sensor, the StressEraser measures HRV from the pulse in your fingertip. The StressEraser Breathwave actually displays the time between your heart beats – known as the inter-beat interval.