It’s as designed. The unit is designed to be outside within documented temperature limits 24/7 – this comes right from the Yarbo engineers (I asked). The circuits are sealed.
That being said, things like rodents can be a different issue, as can damaging storms (hail) and temperature extremes. I bring my rover into the garage and put it on the wired charger for the worst winter weather (and probably will for a hurricane), but I just shove it out the garage door and give it a Work Plan, and off it goes. It’ll find its way back to the Docking Station.
There’s another thread out here right now discussing rodent repellents: Mice and other rodents?