Electrician here from /all who doesn't know much about geocaching. What's the issue? Seems to be pretty accessible with a ladder if you're looking at that dongle hanging from the KO seal on the box.
As someone else said, there are some difficult ones that require climbing gear (which reminds me of playing various MMOs) - one in my town is about 15m up a large tree!
It's not the tag itself, there will be a little cache. What's in it depends, some are give and take some random tokens. Some are logs. You don't really do much, it's more about getting out and exploring your city. I don't do it myself I'm just aware of it.