There's a button there to enable/disable air-mouse functionality (basically the tilting of the remote moves the mouse pointer), though it's awkward to use compared to a normal mouse.
The keyboard on the back is also awkward to use, not just because the keys are small and not quite in standard positions but also because Shift and Alt are both "press to enable, press to disable", with no notification lights (so, say, your keyboard might be in "Alt mode" and you're trying to used it and it's just doing weird stuff).
The thing does work as a combo of media player remote + mouse + keyboard, but it's not very practical for the last 2. Also that specific model seems to have problems with the remote buttons not working if the remote is tilted (which shouldn't be at all a problem given that's a wireless remote).
The idea is good, the implementation could be better. There are other models like that around. Just avoid the "Google" remotes as that's Android-locked and for voice recognition (plus it comes pre-enshittified with only a handful of buttons which only start apps such as Netflix).
Even with the quirks of the remote, whilst using that setup I often find myself altogether forgetting that what I'm using there is a PC with Linux.
