3 available. The Polar H1 Heart Rate Sensor in black is a reliable and high-quality heart rate monitor tailored for unisex adults. This sensor is perfect for various sporting activities like gym training, yoga, and running - it pairs with the majority of gymcardio equipment. The sensor is powered by batteries and does not include a chest strap. Ideal for fitness enthusiasts looking to track their heart rate and average heart rate during workouts, the Polar H1 Heart Rate Sensor is a versatile and user-friendly tool for achieving fitness goals.