Polar H7 Heart Rate Sensor
The Polar H7 Heart Rate Sensor is one of the best and most accurate hear rate monitors for sports and fitness you can buy.
You don't need a compatible watch to go along with your chest strap since there are plenty of apps (free download such as POLAR Flow, etc) and cardio equipment that connects directly to the heart rate monitor via bluetooth.
Form: Chest Strap
Rechargeable Battery: No