Aputure UFC-1S V-Control Follow Focus Remote Controller (Black) One Key Switch Between Still and Video Mode Focus can be Adjusted by Using the Center Control Wheel when Live-View is Turned on Total exposure control; Shutter Speed, Aperture, ISO, Total live-view control; Precise focus & Digital zoom LCD Display for Adjustment Settings ; Multiple Focus Options in Still Mode & Four Focus Point presets in Video Mode Supports firmware updates via USB