The Lastolite Ezybox II Square, Medium is a lightweight light-shaping tool that adds a flattering, low contrast quality of light to studio, battery-powered and shoe-mount flashes. The Ezybox has removable interior and exterior diffusers that can be used in any combination or not at all depending on your subject and desired effect. With both inner baffle and front diffuser in use there is a 2.0 stop reduction in output. Please note that the Ezybox requires separate purchase of a speed ring for use.