Aputure Trigmaster Plus, 2.4GHz Radio Remote Flash Trigger and Shutter Cable Release, fits Canon EOS 1D, 1DS Mark II, III, Mark III, IV, 1DC, 1DX, D30, D60, 10D, 20D, 20DA, 30D, 40D, 50D, 5D, 5D Mark II, III, 7D, and 380EX, 420EX, 430EX, 540EX, 550EX, 580EX, II, 600EX-RT (Discontinued by Manufacturer) Professional premium Grade 3-in-1 Multi-Function Radio Trigger for Flash, Strobe and Camera, 16 Channel, encrypted 2.4Hz with 600 ft. range, Sync Speed of 1/250 sec, when in "flash" mode. Enabled AF with half press of the Remote Button when in "camera" mode, 2 sec, delay function in both modes. In "camera" mode, remote is able to do continuous and "Bulb" by press and hold the trigger bottom for 2 sec, and press again to stop In "Flash" mode, the transmiter wakes up the "sleeping" flash, just in time for firing the flash. 24 Month Warranty