Aputure Trigmaster II, Radio Remote Trigger for Canon Camera and Flash, Speedlight Control Strobe, Speedlight Flash and Camera Shutter (with optional camera cable) 2.4G FSK Radio Frequency, Triggers flashes up to 120m away in open area Awakens most speedlights, inc. Canon, Nikon, Pentax, etc Compatible with high voltage flashes, Compatible with all 2.4G Aputure triggers 24 Month Manufacture Warranty