The Godox TT685F Thinklite TTL Flash for Fujifilm Cameras provides Godox 2.4GHz X System Radio Master and Slave modes. The Radio Master mode can fire and control the complete Godox 2.4GHz Flash System, including cross compatibility with Godox 2.4GHz slave strobes for Fuji. An auto sensing Radio Slave mode can also be fired and controlled by Godox 2.4GHz Master flashes and Transmitters for Fuji. A large dot matrix LCD display provides easy access to the master interface and functions. 3 remote slave groups are provided - A / B / C. And remote groups can be mixed, with TTL and Remote Manual Groups used at the same time, while individual groups can also be turned On and Off easily as needed. Current Fuji transmitter and master speedlites include the X1T-F transmitter, and compact TT350F speedlite, as well as using other TT685F speedlites as master. The TT685F are powered by traditional 4 x AA batteries, with the option of connecting an external High Voltage Battery Pack for faster recycle times etc. The TT685F provide a 3.5mm Sync Port, and USB Port for firmware updates. As well as a 4 pin Communication Port which provides backward compatibility with Godoxs remote manual XTR-16s, / FTR-16s clip-on radio receivers (originally used with the V850 and V860 speedlites). A High Voltage External Battery Port is provided at the front of the flash (Canon style socket), for connecting external battery packs like Godoxs popular PB960, or other Canon compatible packs. When mounted on camera, it is an effective lighting tool with a powerful guide number of 197 at ISO 100 and 200mm, a zoom range of 20-200mm, and the ability to tilt from -7 to 90° and rotate 360°. As a TTL-capable unit, the TT685F can also operate as a full wireless master or slave unit with TTL functionality. Operation is intuitive with a rear LCD panel that shows settings. Also, the flash is equipped with a Wireless Control Port for attaching an optional remote control set and it has a 3.5mm sync port for basic