EACHSHOT&reg; SN910EX-RF Kit i-TTL Wireless Radio Transmission Speedlite Flash Light for Nikon D7100 D7000 D5200 D5100 With SN910TX The First Wireless Radio Transmission RT System speedlight for Nikon cameras in the world. Wireless radio master function and slave function, can be used as on-camera master unit and remote slave unit of RT system. Supports high-speed sync, the maximum shutter sync is up to 1/8000s. Supports multiple trigger modes, and it can be triggered through the set-top of camera, 2.4G wireless triggering, S1 and S2 basic optic slave modes. The wireless triggering distance can reach up to 100m, better to meet your needs.