Brennan audio players can be controlled using a web user interface - or web UI - on any browser on the same local network.
But you need to find and type in the IP address of the Brennan player. That's a bit inconvenient and the IP address can change.
The Brennan app searches the local network for you and quickly starts the browser with the correct IP address - thats it - simple.
There is a small floating menu that lets you switch between different Brennan devices or rescan the network.