The V850ii from Godox is a revolutionary speedlight. It is completely universal and can be used on any camera with a standard hot shoe. It can be controlled completely via the x1t controller. It will also act as a master to control and fire all other X system lights including the ad200, ad600, ad360ii as well as the tt600, tt685 and v860ii speedlights. It has a lithium ion battery that will give you up to 650 flashes before needing recharged. The v850ii is a Manual only flash.. NO TTL capabilities…. if you want TTL, get the v860ii.