Optical 2.4G wireless transmission offer even and stable output. With built-in Godox 2.4G wireless X system, V850II is compatible with AD600, AD360II-C, AD360II-N, TT685C, TT685N, X1T-C, X1T-N, etc. In the 2.4G wireless transmission mode, when used as a master unit, V850II can set its group as M/A/B/C/D/E; when used as a slave unit, V850II can set its group as A/B/C/D/E. There are 1-32 channels to be chosen.