Product Description : TTL Flash light with large guide number GN58ISO100105mmAutomatically compatible to i-TTL and TTL flashsupport S1S2 wireless trigger flash as well Support exposure compensationexposure bracketingsecond-curtain syncAE lockAperture previewcontrast-enhanced flash Super speed of charging recycleit only takes 3 seconds to finish a charging cycle after a full level outputyou can use external power pack to accelerate the charging speed once more Supports automanual zoomingThe flash light covers a focal length rang of 24mm to 105mm Standard canon external power socket satisfy your quick flash requirement