Polar H1 Heart Rate Sensor

I use this with an existing Polar receiver. I run/walk two miles in the foothills with my dog every day and then ride an elliptical trainer. Because I am 75, I monitor my heart rate continuously when I exercise. This unit works both with the Polar receiver and the Diamondback elliptical trainer (ca. 2003). Having battery replaceable is important to me as I have the sensor active two hours per day. My previous sensor was no longer operable and battery could not be replaced.For now, I am pleased and completely satisfied with this product. My only concern is whether the strap fastener will prove to be durable and, if not, whether the strap is replaceable.