Period German electric blanket. It is larger than a heating pad but on the smaller side for a blanket. I was unable to test it so I have no idea if it works, but I don't know if I would trust it, even if it did work. Electric heaters of various types gained popularity in the 20's and 30's and during the war the Luftschutz used small electric heater in bunkers. While I am unsure if there is an specific purpose to this piece, it's got the look and is in good condition. There are a few small rust stains on the blanket itself and the cord has a few insulated wires poking out of the cord cover (probably from being twisted and worn). There is some fraying on the edges.