Interfit INT476 Dynamic Ti Trigger Description. The Interfit Dynamic Ti Trigger is a radio remote controller that can fire Interfit EX400 Ti flash heads with built-in receivers at distances up to 39. 4. The Ti Trigger can handle up to 7 heads by assigning them individual radio ID numbers. In addition to individual or simultaneous triggering you can control On Off modeling light modes & flash power from the Ti Trigger.