Do you have a question about the bit S1 and is the answer not in the manual?
Pair the S1 Smart Watch with your iPhone via Bluetooth.
Access the registration or login screen for the Bit Watch app.
Enter email and password, then tap ENTER to register your account.
Search for the S1 device and select 'Pair' to connect.
Enter email and password for Android Bit Watch account registration.
Grant permission for the Bit Watch app to access notifications.