The FR-WR Wireless Radio Flash Receiver from Olympus is designed for use with their TTL system, and allows you to remotely trigger and control flashes using 2.4 GHz radio transmission. It has a receiving range of up to 30 metres and can operate on one of 15 channels within three groups. A top hot shoe allows an optional flash to be added, and a bottom locking cold shoe makes it easily mountable. Dual rear dials allow for intuitive channel and group selection, and a PC sync terminal is also featured for wired pairing with strobes. It is fully splash, dust, and freeze-resistant, to match the Olympus OM-D-series cameras. Compatible Cameras: OM-D E-M1X OM-D E-M1 Mark II OM-D E-M1 OM-D E-M5 Mark II PEN-F Compatible Commanders: FC-WR Flash Commander Compatible Flashes: FL700-WR