This RF-603C II Remote Flash Trigger Kit from Yongnuo features two 16 channel, 2.4 GHz transceivers as well as a shutter release cable for remote triggering of Nikon cameras with a 2.5mm connection. Each transceiver has a male camera shoe on the bottom as well as a female hot shoe on top for triggering a flash unit. The system has a wireless range of 328? and can sync at speeds up to 1/320 second. Additionally, it has a dual-function shutter release with half-press and full-press capabilities.