The FR-WR sync terminal can be used to connect commercial flash units, such as a monoblock flash, which can then be remotely fired. As is the case with the FL-700WR flash, a dust-, splash-, and freezeproof (-10°C) construction allows use in a variety of fields. With the FR-WR charging completion indication emits an an electronic sound, when flash charging is completed.

Groups and channels can easily be set and checked with dials on the FR-WR.