This product is used to wirelessly control when the flash of a flash head is fired. It is compatible with most Nikon cameras and with YonGuo and Nikon series i-TTL flashes. Most notably, the YN-465N / YN-467N / YN-468(II) / YN-565N / YN568N and the SB-400 / SB-600 / SB-700 / SB-800 / SB-900 / SB-910. This product also supports i-TTL and manual flash, Front-curtain sync, rear-curtain sync, high-speed sync 9HSS/FP), the highest sync speed is 1/8000s, Supports the use of a master unit, FEC, FVL function, modeling flash, red eye reduction flash, flash zooming (auto), built in AF lamp, automatic setting saves and PC port strobing trigger. This product still has the plastic coverings however, we could not get any of the wires for the PC port.