The Coros Heart Rate Monitor offers a comfortable and precise way to track your heart rate during workouts, designed to be simpler and more comfortable than traditional chest straps. It features the latest multi-channel optical sensor for highly accurate heart rate measurements. With the ability to connect up to three Bluetooth-enabled devices simultaneously, it offers seamless integration with your fitness tracking system. The monitor's wear detection ensures automatic pairing for new workouts, minimizing setup time. It provides up to 38 hours of continuous operation on a single charge or an impressive 80 days in standby mode, giving you long-lasting reliability. The heart rate monitor is rechargeable using a magnetic USB cable, and its durable design is water-resistant up to 3 ATM, making it suitable for most training conditions. The adjustable band fits arms from 7.09 to 12.6 inches (18-32 cm) in circumference, ensuring a comfortable fit for a wide range of users. Whether you're running, cycling, or training in other sports, the Coros Heart Rate Monitor is a must-have tool for accurate, distraction-free heart rate tracking.