To synchronise recordings, a WiFi must first be configured. To do this, press and hold the power button again directly after switching on until the LED lights up orange/yellow. A WiFi with the serial number then appears.
Once you have connected, a window appears where you can specify two WiFi. You can also use your mobile phone hotspot. Simply enter the WiFi name and password.
Then press "Save configuration". The device will reboot and is ready to synchronise your recordings.