One muggle camcorder, circa 1973. The salesperson at the store showed Marlene how it works, and she was fascinated by the idea that THEY could show up on the telly, and Marlene told Lily as she opened it that this way they can keep Mrs. P up to date if the war is still going on and she's stuck out of the country after Elvendork is born. And in the meantime they can just have fun with it :D.