Found in my new basement. Appear to be solid metal. About 3”x3” square. No wires. Mounted by the ceiling! What is this?
A questioner said: Found in my new basement. Appear to be solid metal. About 3”x3” square. No wires. Mounted by the ceiling More from the… Read More »Found in my new basement. Appear to be solid metal. About 3”x3” square. No wires. Mounted by the ceiling! What is this?