... 6-stop aperture,1/10 energy variable 1.0=1/32,2.0=1/16,3.0=1/8,4.0 ... and easy to replace.High-effective mode switch ,with large LCD screen.Output power can be adjusted to control the flash ... machine. We’re the first one that developed the digital LCD touch screen studio flash, they can use together with wireless ... and achieve mutual good prospect in the future. Market: LCD Screen Intelligent Studio Light