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Make sure this fits by entering your model number. HYPER-ACCURATE - Patented optical sensor technology for highly accurate monitoring and measurement. Green + Yellow Optical Sensors Provide superior measurement with all skin tones. WORKS WITH VIRTUALLY ANY DEVICE - Great for use with smartphones, tablets, smart and sport watches, exercise equipment and many other devices that support Bluetooth Smart or ANT+ heart rate data. 24 HOUR BATTERY LIFE - Extended use rechargeable battery allows you to workout for up to 24 continuous hours. CUSTOMIZABLE - Change HR zones and modes in the RhythmSync app. Modes include Heart Rate Only, Running (Cadence + Distance), Cycling (Cadence), Swimming, Heart Rate Variability (HRV). INTERCONNECTED ARMBAND DESIGN - The Rhythm24 has an updated quick-lock interconnected armband design to keep the Rhythm24 securely attached to your arm during intense workouts. Scosche Rhythm24 Waterproof Armband Heart Rate Monitor HRM Optical with Dual Band ANT+ and BLE Bluetooth Smart - BISVIIUJP