The Olympus FR-WR Wireless Radiowave Flash Receiver is part of the Olympus wireless RC flash system. You can use it the optional FC-WR flash commander. It works with the OM-D E-M1X, E-M1 Mark II, E-M1, E-M5 Mark II, and PEN-F cameras. The receiver can function within a range of up to 98 feet. It has a channel setting dial and group setting dial for easy adjustment of groups and channels individually. You can use the receiver for studio photography by connecting a mono block strobe via the synchronization terminal.