Aputure 2.4 Ghz Trigmaster Kit (One Transmitter & 2 Receivers) Radio Remote Flash Trigger & Shutter Cable Release for 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
The Aputure Trigmaster is a premium-grade multi-function radio trigger for your flash, strobe and camera shutter.  All you need to do is mount the transmitter onto the camera, speedlight flash or your studio strobe flash, to wirelessly control these devices. While in camera mode, the remote is able to do continuous shooting and “bulb” shooting (the lens remains open as long as you have your finger on the trigger button).