The FR-WR sync terminal can be used to connect commercial flash units, such as a single-block flash, which can then be triggered remotely.

Its dustproof, waterproof, and frost-resistant (-10°C) construction allows for use in a variety of conditions.

With the FR-WR unit, the charging completion indicator emits an electronic sound when the flash is fully charged.

Setting and controlling groups and channels is easy thanks to the selectors on the FR-WR unit.