The Scosche Rhythm+ Armband Heart Rate Monitor improves upon traditional heart rate monitors. Though chest-strap heart rate monitors are common, they are less comfortable than this heart monitor. Also, the Rhythm+ heart monitor is more accurate than wrist-worn heart rate monitors thanks to PerformTek biometric sensor technology. This technology has been proven to provide accurate readings during many different types of exercise. Truly a fitness monitor, the Rhythm+ tracks calories, distance, pace, and intensity. All of this information will sync with the popular fitness app of your choosing. Whether you use Strava or MapMyFitness to track your health goals, the Rhythm+ is compatible. You can wear this armband heart rate monitor on your bicep, tricep, or upper forearm. And if you regularly exercise, you won’t have to recharge this watch until you’ve used it for eight hours.