Scosche Rhythm R+2.0 Waterproof/Dustproof Aerobic Armband Tracker with Dual Band ANT+ and BLE Bluetooth Smart,

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NEW STRAP DESIGN: Flexible, Hook Style armband secures Rhythm+2.0 comfortably on biceps, triceps, or upper forearm. Measurements: 40cm max to 17cm min – 15.75in Max to 6.7in Min.
LONGER BATTERY LIFE: Rechargeable battery provides up to 24 hours of workout time between charges. Shares the same (included) charging cradle as the Rhythm 24.
SUPERIOR ACCURACY: The optical sensor technology in the Rhythm+2.0 utilizes green and yellow LEDs to measure blood flow for a highly accurate reading with all skin tones. A built-in accelerometer further assists in providing hyper-accurate measurements.
UNIVERSAL CONNECTIVITY: Works with all Bluetooth Smart and ANT+ enabled devices and equipment: watches, fitness equipment, smartphones, and tablets. Works with over 200 popular heart rate monitoring fitness apps including fitdigits, wahoo fitness, mapmyfitness, runkeeper and more!
DURABLE DESIGN: Rated IP68 – dustproof and waterproof construction can be submerged up to 1.5 meters for 30 minutes making the Rhythm+2.0 waterproof and sweatproof for your toughest workouts.