Mamiya 645AF/Phase One Remote Control Set RS402 RS 402
This is an infrared release for the 645AF line cameras. I have used this system extensively and while I was initially skeptical of the infrared connection I have found it a lot more reliable than radio systems.
The set consists of a handheld trigger and a receiver that attaches to the camera and plugs into the side port. It takes common batteries (one 9v and two AA).
This set is in clean condition and works perfectly. The battery compartments are clean.