Scosche RHYTHM+ Heart Rate Monitor Armband - Optical Heart Rate Armband Monitor With Dual Band Radio ANT+ and Bluetooth Smart Workout tool for managing heart rate, calories burned, distance, pace and more RHYTHM+ works with most popular health and fitness apps, including: digifit, run keeper, mapmyfitness, Strava, and more Works with all Bluetooth Smart and ANT+ enabled devices and equipment: watches, fitness equipment, smartphones, and tablets Breathable lightweight Armband - no need for a bulky chest strap Ip67 waterproof construction can be submerged up to 1 meter Heart rate monitor armband Train Smart, get fit, the Scosche RHYTHM plus Heart rate monitor is an all new workout tool for managing heart rate, calories burned, distance, pace and more, accurately monitor your intensity level. RHYTHM plus works with most popular health and fitness apps, including: DigiFit Run keeper MapMyFitness Strava and more RHYTHM+ heart rate monitor is a direct chest strap replacement and easily attaches to your forearm for full wireless communication with your device. This app powered heart rate monitor uses an App to manage your workout metrics. Use your favorite fitness app on your smartphone or tablet to monitor your heart rate, calories burned, distance, speed, pace and more. With its dual-mode processor you can simultaneously transmit your heart rate to multiple ANT+ displays and your favorite Bluetooth Smart enabled watch or smartphone app. Green/Yellow Optical Sensors 8 Hour Battery Life IP67 Waterproof Bluetooth Smart - 100ft Range ANT+ Compatible Compatible with Smartphones, Fitness Equipment, Fitness Watches &amp; more