Got a German one 20 years ago, ciclomaster, battery inside screwed cap.
Wired , single line, small display.. best thing about it was the fork blade mount,
so It did not occupy handlebar space, or my attention, riding.
Are you needing to dive with your bike?
Trek/bontrager has a small O ring on the battery compartment, and pops off
so you can stow it out of constant rainfall rather than leave it on 24/7/365.