Features: Built-in transceiver and receiver, compatible with YONGNUO RF radio triggering system (RF602/603) During radio transmission flashing shooting, this product can be used as a master unit or a slave unit. It is fully compatible with RF radio trigger signals of YN650EX-RF / YN685EX-RF / YN320EX / YN685(II) / YN720 / YN560 IV / YN660 / YN560 III / YN560-TX (pro) / RF603 / RF602 / YN32- TX. And it also contains 16 transmission channels and 10000 wireless radio IDs, which facilitates multi-flash lighting. Support multi-group flashes, independent control When used as a radio head unit, the product is able to control 5 independent groups, realizing remote control of flash mode, flash output and focal length for YN650EX-RF/ YN685EX-RF / YN320EX / YN685(II) / YN720 / YN560 IV / YN660 / YN560 III. Support Optical Transmission Wireless Slave Flash In optical transmission, wireless flashing shooting, YN685EX-RF can be set as a slave unit to receive optical transmission wireless trigger signals from YN320EX and Sony flashes such as HVL-F32M, HVL-F60RM, HVL-F60M, flashing off-camera TTL mode operation. high NG; Support TTL, M and Multi Mode, GN60@ISO100, 200mm high-speed sync flash, support TTL, M, Multi flash, with high-speed sync function, all shutters are available for shooting, the maximum speed shutter sync is 1/8000s. Firmware Upgrade The product is equipped with a USB port, you can download the latest firmware from YONGNUO official website to upgrade the product. Super fast recycling system; Supports power bank Flash recycling with full output only needs 2s to work. Even if the battery is not new, it only takes 3-4s to complete fast flash recycling. With the use of an external battery, higher recycling needs can be met. Real-time display of power consumption With the real-time display of battery power, it is easy to know the power consumption. Electric Zoom Equipped with automatic zoom and manual zoom, the flash coverage can be adjusted within the range of 20-200mm, so that the fill light is more uniform and effective. Sound Prompt, Custom Function and Auto Save Function LCD Display Screen and Standard PC Synchronous Interface Equipped