Aputure 2.4Ghz Trigmaster Kit (One Transmitter + 2 Receivers) Radio Remote Flash Trigger and Shutter Cable Release, for Nikon DSLR D200, D300s, D300, D700, D800, D800s, D1, D2, D3x, D3s, D4, and SB-600, 700, 800, 900, 910 Premium-grade 3-in-1 multi-function radio trigger for flash, strobe and camera 16 channels, encrypted 433MHz with 360 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" modes. Set "bulb" by pressing and holding the trigger button for 2 seconds, and press again to stop Includes a 24 Month Manufacturer Warranty