- The SU-4 Wireless Remote TTL Flash Controller enables wireless remote flash with automatic TTL or manual exposure control
- Can be attached to any current Nikon Speedlight and many previous models
- 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
