The Godox TT520II flash unit has 8 steps of power output control and three modes, satisfy different photography environments. Features: The TT520II flash unit has 8 steps of power output control and three modes, satisfy different photography environments. Godox shoe-mount flash has a fast recycle time of approx 0.1-5 seconds. Thanks to its 1/300s~1/20000s flash duration, this shoe mount flash gives you ideal exposure.