The Madgaze anroid app is just a settings app.
If you use the 3 in 1 adapter you need a “display link” app to mirror the screen.
If i connect the glasses to my PCs USB-C it is recognized as a screen. My phone has an older USB-C stantard, so that does not work without the adapter.
You can adjust the screen brigtness on the adaper or in the Madgaze app. Thr glasses also have a brightness sensor and a camera.
For the adapters battery life no exact idea, but for the moment I have no reason to doubt the specs.
Edit: anything where you mostly look straight is great, game, video. But something like excel, where your eyes go to the sudes/corners a lot makes it a bit unsharp.