Yongnuo RF-603 N1 2.4GHz Wireless Flash Trigger/Wireless Shutter Release Transceiver Kit for Nikon D1/D2/D3/D200/D300/D700 Works as a wireless shutter release control to trigger your camera Transceiver System - works as a wireless flash trigger and receiver Each RF-603 is designed to work as trigger and as receiver Compatible with Nikon D1/D2/D3/D200/D300/D700 Series cameras for shutter release control Includes (2) RF-603 transceivers (1) N1 shutter release cord