CD/Radio in trunk

I have a clarion cd changer from about 1993...it has wireless remote.
I mount it in back and works great.

One question when looking at decks I would ask is:
Is the remote infrared or uhf. UHF can shoot through and work deck without a direct "line of sight" like infrared needs.

Mine is infrared but has small screen that mounts on dash. This works with line of sight.