"Made especially for use with a Canon 3-pin connection, this unit adopts a global FSK 2.4GHz wireless channel that can work anywhere, and in suitable environments can reach up to 100 meters. It can be set to a single transmission state, which is more convenient for testing the flash, and it can also be set to tranceiver state. You can also automatically switch between the two. Transmitter supports single contact triggering, as well as wireless triggering, via the camera hot shoe. It's also PC-sync ready and can be connected to a network of flashes and shutter triggers for studio use. The highest flash sync speed this light is capable of is 1/320th of a second; different camera models may only be capable of 1/250th."