Your smartphone and the breathe ilo cycle tracker are connected via Bluetooth.
The connection and control of the breathe ilo cycle tracker works via the “breathe ilo 2.0” app only. On your breathe ilo cycle tracker itself is only one on/off button available. Please always keep the app up to date to ensure you are using the latest version.
Take a look at the user manual in section “3.2.2 Bluetooth Pairing” to learn how to connect the breathe ilo cycle tracker with your smartphone correctly.