Compact & Lightweight 

                     Weighing only 14g, designed for long-term comfort.

                     About the weight of two coins

                     Accurate Heart Rate

                     Measurememt

         90-Hour Battery Life

                     Dual-Beam Sensor 

                     Enhanced accuracy with sweat-resistant 

                     channels for uninterrupted data.

                     Using Photoelectric 

                     Detection Method

                     The A4 uses optical sensors to detect blood hemoglobin levels 

                     and advanced algorithms to calculate heart rate.

                     Comfortable fit 

                     Using soft and breathable materials, the A4 heart rate armband 

                     provides a comfortable wearing experience, and long-term 

                     cycling will not feel pressure or discomfort.

                     Comparison of Data Collected 

                     from the Same Source:

                     Soft, breathable fabric strap 

                     Easy Attachment: Velcro strap for quick and secure fastening. 

                     Large front button 

                     for easy blind operation.

                     LED Indicators: Battery Levels

                     Green: 100% -51% battery life, Orange: 50% -21%, Red: 20% -1% battery life

                     Note: Long-press the power button to turn off when not in use and conserve battery power.

             Compatible with below GPS Bike Computer 

             headunits and more.

             Navihood，GARMIN，WAHOO，BRYTON，GARMIN，SUNNTO，Huawei GT

                            BLE5.0 and ANT+

                            Navihood, Zwift, Garmin Connect