SHANNY SN910EX-RF 2.4GHz Master Slave i-TTL Wireless Radio Transmission RT System Speedlight Flash for Nikon D810 D800 D700 D750 D610 D300s D300 D7100 D7000 D90 D5300 D5200 D5100 D3100 D3200 D3300 Shanny SN910EX-RF is the First Wireless Radio Transmission RT System Speedlight for Nikon cameras in the world. Wireless Creative Light System (W-CLS) Build-in 2.4G wireless radio master and slave flash GN60/i-TTL/M/RPT/HSS 1/8000s Trigger mode: On-camera flash, 2.4GHz Shanny RF Wireless System, S1 & S2 Basic Optic Slave Modes