To prevent other people from changing the source on your BDS through Bluetooth, you can disable the “Automatic Playback” function in the System Settings of the BDS ( 280, 580, 280S and 580S ). This does not prevent others from connecting to one of the two Bluetooth receivers in the BDS units, but it prevents other people from “interrupting” your playback source. This is where the change is done: Settings – System Settings Automatic Playback ( Enable/Disable ) Enabled: People can connect to your BDS and start playing music/audio. Your BDS will automatically change source ( or switch on, when BDS is in Standby mode ) from any source. Disabled: People can connect to your BDS, but the BDS will not automatically change source, or go out of Standby mode when a music/audio signal is sent through Bluetooth.