Optical and Built-in 2.4G wireless transmission to offer stable output. When using Godox 2.4G wireless X system, AD600B is compatible with Canon E-TTL II autoflash, Nikon i-TTL autoflash, SONY etc. As a slave unit, AD600B can use in combination with Godox TTL camera flash,TTL outdoor flash, TTL studio flash, etc. Use Godox 2.4G wireless X system to achieve TTL control or use Godox TTL wireless flash trigger X1 to wireless control TTL functions, wirelessly adjust flash's power levels, sound beep, as well as triggering the flash. There are 3.5mm sync cord jack and wireless control port to achieve multiple triggering methods. AD600B has 600Ws and GN87, Stable color temperature at 5600±200K over the entire power range. 25 steps of power adjustment(1/1 to 1/256) offer bettert lights effects. Fully support TTL autoflash, flash exposure compensation, 1/8000s high speed sync, first-curtain sync, second-curtain sync, manual flash, multi flash, C.Fn custom functions, etc.