Aputure 2.4 Ghz Trigmaster Radio Remote Flash Trigger Receiver, for Nikon SB-600, SB-800, SB-700, SB-900, SB-920 Speedlite Flash 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