How long can I have this charm for?
It seems I forgot to pack my amulet.
You shouldn’t wear multiple lucky amulets at the same time. It could bring you bad luck instead.
You know how 守る is "to protect," right? This is like that, but it's the noun version. It's not really "a protection," though it kind of is. What things can you wear to protect you from things like bad luck, demons, and ancient aliens? That would be a charm or an amulet. You'll see these kinds of things sold at temples and such.
The reading is like that of 守る, so if you know the reading of that word you should be able to read this one as well.