Scosche Rhythm+ 2.0 Heart Rate Monitor Armband for Running, Cycling, Exercise & Recovery with Bluetooth, ANT+, Optical Sensor for HRV & RRi Data, IP68 Waterproof Fitness Tracker with 24hr Battery Life

Precise Heart Rate Monitor Armband: Delivers accurate real-time tracking for running, gym workouts, and indoor or outdoor cycling. Pair via Bluetooth or ANT+ to your sports watch, fitness equipment, or fitness apps to monitor workout intensity and performance
Recovery Insights: This heart rate monitor’s HRV mode captures precise RR interval data from subtle heartbeat variations, giving you deeper insight into training, sleep quality, and daily stress. Stream RRi data to HRV4Training, Morpheus Training, Welltory, and other HRV apps
Secure Comfortable Fit: A lightweight, breathable strap adjusts securely to your forearm, bicep, or tricep and stays put during intense workouts. A wearable heart rate monitor for exercise that serves a dependable alternative to restrictive chest straps