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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. Detects the firing of the master flash (including built-in Speedlight) and sends a firing start signal to the slave unit. Terminates the firing of the slave flash by detecting firing stop signal. Eliminates the need for connecting cord. Operates effectively up to 23 or 25 feet from the location of the main flash.