The Lezyne HR Flow Heart Rate Sensor is engineered for reliability and comfort, making it an essential tool for fitness enthusiasts. Designed to meet Bluetooth Smart standards, it ensures maximum compatibility with various devices. The sensor features a durable yet lightweight polycarbonate body with a translucent design, paired with a soft and flexible elastic chest strap for a secure fit. With a long-lasting replaceable CR2032 coin cell battery, this heart rate monitor provides consistent performance for all your training needs.