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Put simply, the emWave 2 is a handy little gadget that monitors your heart rate and lets you know what you need to do to calm yourself in moments of stress. The data it records can be offloaded to your PC so you can track progress and see what it looks like when your heart is stressing out. It's a great solution for those of you who are up for learning how to unwind stress via breathing and mental relaxation techniques.
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