Yongnuo RF-602 N 2.4GHz 100M Wireless Remote Flash Transmitter + 3 Receivers for Nikon D7200 D7100 D7000 D3300 D3200 D3000 D5000 D5100 D5200 D5300 D500 D700 D810 D60 D50,et. 1.RF-602 N uses 2.4GHz channel and FSK modulation,15 selectabh frequency channels. 2.YONGNUO RF-602 :Flash sync speed is up to 1/250s. Maximum operating distance is up to 100 meters. 3.YONGNUO RF602 flash trigger:Support the flashgun wake-up function, (Wake up can only used in TTL Compatible flash) 4.YONGNUO flash trigger:Fire the flashgun through hot shoe part and fire the studio light through PC socket. 5. Wireless flash trigger:support M mode. This item is not compatible with SB-400.