The Bryton Smart Heart Rate Monitor applies both ANT+ and Bluetooth technology. It wirelessly transmits your heart rate to cycling computers and smart phones. Easy to Use Smart Heart Rate Monitor goes with a soft elastic strap, providing you a comfortable fit. Dual Support Featuring the application of dual technology, ANT+ and Bluetooth, Smart Cadence Sensor is able to connect to both cycling computers and smart phones. It is compatible with most devices on the market. Improve Yourself Accurately measure your heart beat and captures results to your device for instant feedback or later analysis on Strava, TrainingPeaks and other training sites Specification Wireless Technology: Bluetooth 4.0 & ANT+