Shanny SN910EX-RF Wireless Radio Build-in 2.4GHz Flash Speedlite Master/Slave i-TTL HSS 1/8000s GN60 for Nikon D810 D800 D800E D700 D750 D610 D600 D300s D300 D200 D7100 D7000 D90 D80 D5300 D5200 D5100 D5000 D3000 D3100 D3200 D3300 Trigger mode: On-camera flash, 2.4GHz Shanny RF Wireless System, S1 & S2 Basic Optic Slave Modes Slave flash: Wireless slave 2.4G RF for Nikon, S1 & S2 Basic Optic Slave Modes Flash mode: i-TTL/M/RPT,Guide Number: GN60(ISO100,200mm) High-speed sync: 1/8000s Shanny SN910EX-RF Wireless Creative flash system master unit, slave unit