This is the OM SYSTEM wireless remote control RM-WR1. Purchased new at the same time as the OM-1. For details on compatible cameras, please see the OM SYSTEM website. Compatible with OM-1 Mark II, OM-1, OM-5, and OM-5II. The OM-3 does not support remote cables from the start. No outer box, wired remote cable, or instruction manual. (Wireless) Body only. If you have a cable, you can also use it as a cable-type remote. In excellent condition. Can also be used for release lock for long exposures, such as for starry skies. I think you should replace the CR2032 battery inside. #RMーWR1 #WirelessRemoteControl #Olympus #OMー1