The latest generation of Scosche's wearable fitness technology, the Rhythm+ 2.0 is a highly accurate heart rate monitor designed to fit comfortably and unrestrictively on your arm. The battery power has been tripled to 24 hours, while the green and yellow LEDs with a built-in accelerometer accurately measure blood flow on all skin tones.Connecting to over 200 fitness apps as well as cycling computers and smartwatches, the Scosche has an impressive 100ft range and a dual-mode radio that transmits to ANT+ and Bluetooth devices. Heart Rate Monitor with precision biometrics24 Hour Battery LifeWireless up to 100 ft. rangeGreen/yellow optical sensor arrayWorks with 200+ fitness appsDurable IP68 design - waterproof & dustproofDual-Mode Radio transmits to both Bluetooth and ANT+Comfortable strap fits to bicep, tricep or forearm