TX-G is an optical heart rate monitor that combines with comfortable, simplicity and easyoperating. There are four different modes - Walking Running Spinning, and Cycling. You can hold the button a second to switch the mode. Measuring with precise photoelectric signals, TX-G provides real time heart rate data, help users to improve exercise efficiency and avoid injury. It is compatible with various fitness apps like Zwift, Strava, Heart Zones, or Endomendo, thanks to BLE and WALKING ANT+ connectivity.