Features: Radio Trigger: Insert a radio module, as a remote dependent unit, can be compatible with the radio trigger system.  The set-top ETTL flash: Install it on the Canons camera to achieve automatic flash photography.  Optical signal master control functions: Automatic wireless remote control flash (optical pulse).  Autofocus auxiliary functions.  Automatic zoom functions, flash zoom position can be back and forth with the change of the focal length of the lens.  Supporting access to the Canons menu.    Specifications: Guider number: GN60 (ISO100, 200mm);  Wireless Flash: Radio transmission Slave, Optical pulse transmission Master/Salve;  Flash mode: ETTL, M, MULTI;  Zoom range: Auto, 20 ~ 200mm (When using wide-angle dispersion plate is 14mm);  High-speed sync: 1/8000s;  Master flash: Master optical pulse signal transmission;  Slave flash: Optical pulse SLAVE Canons, light trigger, S1/S2, wireless SLAVE (NEED to upgrade the software first);  Shutter Synchronization: High-Speed Sync, Front-curtain Sync, and Rear Sync;  Flash exposure compensation: Support (with an increment of 1/3 gear in +/-3 gear);  Bracket exposure: Support;  Flash exposure lock: Support;  Modeling flash: Support;  AF Assist-focus:  Support;  Manual flash: 1/128 ~ 1/1 (with an increment of 1/3 gear);  Frequency flash: 1 ~ 199Hz;  Recycle time: Quick flash less than 2s, ordinary flash less than 3s;  Radio transmission channels: Radio, optical pulse;  Wireless transmission distance: Radio about 100m; optical pulse about 20m;  Flash ratio: 8:1 ~ 1:1 ~ 1:8;  Flash Groups: Support for multiple flash grouping;  Power supply: 4 x AA batteries (Alkaline or Ni-MH is usable, not included);  External interface: Hot-shoe, PC synchronous interface, external charging interface, external expansion interface;  Software upgrade: Support;  Battery life: Flash 100 ~ 700 times;  Package Included: 1 x Mcoplus MT600SC Flash Speedlite;  1 x Mini Stand;  1 x Mcoplus Cloth;  1 x 12 Color Fitter;  1 x User Manual;