Nvidia Shield TV PRO Review

It has a setting to keep emitting a "silence" sound, just to keep the soundbar (or audio system) awake.

Better hardware than most other products running Android TV.

It can access remote storage (e.g. from NAS) using either SMB or NFS protocols.

There is an Android app that works as a remote control. In fact, the app can simulate either directional keys, or a virtual mouse using an on-screen touchpad.

You can configure the brightness of the backlight of the buttons of the remote. And such backlight will automatically turn on when it detects movement, and turn off seconds later.