Heartmath Inner Balance, Several Users?
I'm a high school teacher and I have some students who are seriously stressed out. I was going to make a little corner of peace in my classroom and have the HeartMath Inner Balance gear for those who would like to download the app, sit, and chill for a few. Could anybody plug it in to their iphone, clip it on the ear and get going? If I have 20 students who came in throughout the week, would there be user issues with this hardware?