EACHSHOT SN600C-RT 2.4G Wireless Flash Speedlite HSS 1/8000s Radio TTL on-camera GN60 For Canon RT With Built-In Radio Powerful radio slave and hot shoe flash for Canons new RT flash system Remotely as a RT radio slave it works together with a Canon ST-E3-RT or SN-E3-RT commander or with a Canon 600EX RT master flash. Furthermore it offers manual optical slave modes Offer full feature set including e-TTL, HSS (high-speed-sync) up to 1/8000s, GN60, a wide zoom range of 20-200mm and many more