Shanny SN600SC Master E-TTL Flash Speedlite Flashgun for Select Canon Models Guide Number: GN62(ISO100,200mm) Wireless Flash: Optical transmission Master/Slave, Radio transmission Slave Trigger mode: Set-top flash, optical transmission, radio transmission, light trigger Flash control: 8 levels of output control (1/128~1/1), 22 levels of fine tuning,Flash mode: TTL/ M/Mult High Speed Sync 1/8000s GN62 Flashgun, Compatible for Canon 1100D 1200D 550D 500D/T1i 600D 650D 700D 60D 70D 7D 7DII 6D 5D II 5DIII 1D X/1D C