This is a Vintage Radio Shack 4 Way Speaker Selector Switching System Control Unit 40-137.  It works great.  Please email any questions. It measures 7-1/8" w x 4-1/2" D x 2" H.  Please use the shipping calculator for USPS priority or parcel post shipping rates. Delivery confirmation is included.  See my other auctions for other Stereos, electronic items, beer signs, Video games and other collectible stuff.  Combine auctions to save on shipping. Pickup is always welcome on any of my items.