Godox TT685C is a fully-featured E-TTL (II) flashgun, much like the older model TT680 but with an addition of built-in 2.4GHz radio receiver. It is a part of Godox’s long awaited 2.4GHz TTL radio flash system, now accompanied by the X1-C TTL triggers. Godox flash system is one of the most comprehensive radio flash systems currently available. Whats impressive about the Godox flash system is not only the large range of lights, with full compatibility between remote manual and TTL equipment, but also intercompatibility between Canon, Nikon, and Sony TTL compatible versions