The Albrecht Audio Max-Sound 900S Wi-Fi speaker plays music from the home network, the internet, or Spotify. All functions can be easily controlled via the UNDOK app on a smartphone or tablet, eliminating the need for tangled cables or additional playback devices like a CD player.

The necessary device pairing takes place through the intuitive app menu. If multiple speakers with Wi-Fi reception are available at home, they can be connected as a group using the Multiboom function. This allows music to be played synchronously through the Wi-Fi speakers in multiple locations at home or in a large room like the living room.

Alternatively, individual music selections for different rooms can be made through the app. For example, a children's audio play can be running in their room while parents control their music playlists for enjoyment in the living room, bedroom, or kitchen from their smartphones.