This Power Winder fits the Chinon CE-3 and CM-1 and probably The CM-2 and CM-3 as well. I believe the PW-500 does not have the interval timer that allows the camera to fire at a set interval (30 sec. max) and number of frames (1 to 25) before it stops. Note the way the body contacts go, along the side. This fits the Screw mount Chinon cameras.
Battery case, takes 4 AA batteries. Small plastic locking lever
keeps it closed
Metal tabs inside body contact battery case. Clean them with both "pen" eraser" if you get no power situation.