Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great, simple heart rate monitor

When I was shopping for a heart rate monitor, I was shocked to see all of the choices out there. This heart rate monitor is just that, a heart rate monitor. It is not fancy with complicated functions that you would need to take a class to learn how to use. It is simple. It's a watch or a heart rate monitor. To switch back in forth, only one large button needs to be pushed. It will also record your workout time, average heart rate, and peak heart rate. I love the simplicity of it. And I have had great success with it quickly picking up my heart rate.