A sleigh mounted deflector dish. What ? You thought it was magic ? There’s no such thing; it’s all salvaged alien technology.
Like Rudoph’s famous red nose; that’s an implanted cybernetically controlled version of a Martian heat ray, in case the Commies tried to shoot Santa down. Santa got the tech back when he defeated the Martian invasion.
You didn’t know that was him ? Come on; surely you didn’t think it coincidence that they all got sick at the same time ? That was Santa; the Martians were really naughty, so he left them some plague in their stockings.