Scosche - Rhythm+ Heart Rate Monitor in Black The Scosche Rhythm+ Heart Rate Monitor (Black) provides you with an accurate reading of your activity level and performance as indicated by your heart rate. The Scosche Rhythm app for iOS and Android devices will display your workout summary, which will include, duration, average pulse, calories burned, distance, and more. When used with a headset the Rhythm+ will provide feedback as to how your workout is going based on the goals and targets that you set. The Rhythm+ uses GPS data so that you can review your routes on a map.