The SU-4 Wireless Remote TTL Flash Controller enables wireless remote flash with automatic TTL or manual exposure control.
Can be attached to some current and prior Nikon Speedlight models and cameras.
The SU-4 detects the firing of the master flash (including a built-in Speedlight) and sends a firing start signal to the remote unit.
It eliminates the need for a connecting cord. The SU-4 operates effectively up to 25-ft. from the location of the main flash.
The SU-4 Wireless Remote TTL Flash Controller allows for remote flash operation with some current and previous Nikon Speedlights and camera models.
The SU-4 also terminates the firing of the remote flash when it detects the firing stop signal.
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