Apparently the heart rate monitor is simply tied to a motion sensor, and depending on how you pull it, it will issue a push, respectively. I squatted 30 times without a gadget, then I put it on and it gave me a resting pulse in the region of 70, or vice versa, you lie on the couch, let your wife shake them for a minute, put them on and voila, the pulse is 145. You put on sweaters on top and voila shows the pulse. In short, a toy for children, I didn’t believe the negative reviews in vain, I thouSee full review