Twin1 R4N Infrared wireless/wired Remote Control Fits Nikons with 10 pin connector and many cameras with built in Infrared receivers. Ideal for Studio Use: The Twin1 R4N Receiver plugs directly into the 10 pin socket of your camera leaving your hot shoe available for flash or other accessories. The R4-Set give photographers extended operational range, allowing them to make all kinds of difficult shots possible. Each set comes with both a R3-UT transmitter and a R4N receiver. Package contains Transmitter, Receiver, Release Cable, Transmitter Battery, Strap, IR Channel Reset Pin and Manual.