Interfit INT119 EXD200 Home Studio Twin Flash Kit Description. The Interfit EXD200 is lightweight & stylish yet very robust & it is designed specifically for 21st century photographers on the move. The 5 volts Sync voltage makes them highly suitable for use with all current digital & film cameras. Touch button controls allow the desired power levels & functions to be quickly set. The EXD can also overcome the problem caused by cameras that send out a pre flash before exposure a simple press of the touch button controls tells the EXD to ignore any pre flash. Accurate power adjustment in one tenth of an f-stop increments over a 4 f-stop range & a high guide number of 45 135ft ensure the exact amount of light required. A built in Infra red slave cell allows freedom in the studio when used with the Interfit IRX transmitter. INT411