The Opteka Remote Control Set is a 16 channel Radio Remote for operating digital cameras at distances up to 320ft (100m). The Opteka Remote Control Set consists of two parts: a receiver/trigger that connects to the camera's cable release socket, and a separate sender. The remote can have a range of up to 100m under optimal conditions, and it features a two-position switch, for focusing operation or shutter release. Batteries included for instant usage.