The Interfit I Sync 4 has 4 independent radio channels for use where multiple photographers may be using wireless triggers such as at a wedding etc. Now you can set the channel and still keep on shooting without interference from other photographers. Each receiver has a built in light stand tread on the bottom to allow your speedlite to be stand mounted. In addition a PC sync cable and socket is included along with a mono jack converter to fit both large and small jack sync sockets for connecting to studio lighting. Runs on long life lithium batteries (included).