Polar H1 Heart Rate Sensor

I purchased two of these for my fitness competition training and I only used one. This is brand new and unused but I opened the box for some reason. Here’s what my coach said the benefits/purpose of this gadget are: . “Use a Polar heart rate monitor WITH the chest strap to track calorie burn. Don't use the calorie counter built into the cardio machines as these are notoriously inaccurate. And don't use a fitbit for weight training or interval cardio...you need the chest strap for this, so get the Polar with the chest strap.”