1. It is used to connect to Fiido smart watch , The name of the Fiido smart watch is "Fiido_S3". and cooperate with the smart watch to record your steps, sleep, heart rate and other sports details. In addition, this APP also supports pushing SMS reminder notifications, incoming call reminder notifications, and other application messages from the mobile phone to the smart watch (Fiido_S3). 2. The control application for Fiido electric bicycles has a Bluetooth connection. You can issue commands to control the bike and also preview the cycling status in real-time. 3. Social module, where users can post the daily life of Fiido electric bicycles. We hope Fiido can bring you joy and convenience.