According to the manual, it is "Spotify Connect", i.e. it is controlled via mobile phone and uses the Spotify app on the mobile phone to identify the user / subscription. Enclosed is the text from the manual of the i205 (I don't use Spotify ;-)

"8.9 Spotify Connect
Use your smartphone, tablet or computer as a remote control for Spotify. Visit spotify.com/connect to find out more.
more. Connect your DABMAN i205 to your Wi-Fi network, open the Spotify app on your smartphone, tablet or PC, and connect to the same Wi-Fi network.
and connect to the same Wi-Fi network. Play a song on Spotify and tap 'AVAILABLE DEVICES'.
Select the DABMAN i205 and listen to the music throughout the room. "

Hope that answers the question.