* Wireless triggering sensor: It can works in outdoor environment under S1 and S2 mode, the wireless triggering distance is up to 10-15M in outdoor, 20-30m in indoor.* Super speed of charging recycle: It only takes 4 seconds in charging* The improved power saving mode: In the power saving mode,the flash will get automatic sleeping.* The brightness of the fine control: The brightness is more refined, 8 levels of output control(1/128-1/1), every level have six fine adjustment, cooperate different zoom value to get the flash effects that you demand for.