It was the first fully automatic exposure Electric Eye (EE) system Japanase TLR for simple using like a point and shot camera. It is collectible because it is rare.
It uses 120 roll film for 6x6cm frames. The Yashinon 80mm f/3.5 lens is in Yashica single speed shutter (1/60) with the aperture automatically set by the built in selenium cell light meter that surrounds the lens. The film winding is semi-automatic. It has built in flash for peanut flash bulbs and its AG-1 flash socket is hidden behind the name plate. It has X sync and plain filter mounts. There are some cosmetic variations on the Yashica-E.