Reliable - The Transmitter
When you harness the horse, the Transmitter when snapped into the belt it will be positioned just below the harness pad and just to the rear of the girth strap.
Using the CS600 anytime is good, resting, walking, jogging training or shipping. Whenever you want to know the heart rate.
Push the red button on the CS600 and within seconds you'll see the heart rate. Push the button a 2nd time and you will be recording the data.