This is an automatic shutter unit made for a camera and is a beauty. Complete with 1 solenoid (6.3V 330uF), 2 cadmium sulfide photo electric light sensor that determines the exposure and tells the solenoids when to open and close and hence the shutter speed. Has a Sanyo LB8605 integrated circuit which we believe to be a self timing chip and film speed sensor. We don't know what camera it was made for and don't have voltage requirements or other specs. Assembly is 2-17/32" long by 2-1/2" wide. Shutter opening is 1/8". Lots of small plastic gears in these. Unused in original static shielding bag.