Voeloon 810-RT Multi-Channel 2.4GHz 2-IN-1 i-TTL 16 Channels Wireless Flash Trigger for Canon Control compatible Nikon Speedlight flashguns over distances up to 100m. 2.4GHz radio frequency triggering operates reliably, even when shooting outdoors and around corners  direct line of sight not required. Working with the I-TTL flash metering system, the 810-RT ensures wireless flash exposures are accurate and consistent in all situations. In complex lighting conditions make use of exposure compensation for more control of light output The 810-RT controls the exposure of 3 groups of flashes for creative results with DT, Manual and TLL mode. And with 31 channels set up. Sync the flash at shutter speeds faster than the maximum sync speed of the camera by using high-speed sync flash. This allows you to still shoot at wide-apertures in bright daylight and so make use of faster prime lenses. If your Speedlight without the high-speed sync, you can use the DT mode and set the flash as Manual mode with full power for high-speed sync. For inside or outside working, the 810-RT provides a working range of over 100M