Feature:1. Built-in 2.4G Wireless Trigger SystemCan work as a master or a slave unit, and fully compatible with RF radio triggering signals from other YONGNUO\u0027 speedlite. Supports 16 transmission channels and 10000 wireless radio ID, which makes it easy for multi-flash lighting.2. Supports Multi-group Flashes Independent ControlWhen as a master unit, the camera flash is able to control 5 independent groups to realize remote control of flash mode, flash output and focal length for YN650EX-RF/ YN685EX-RF/ YN320EX/ YN685(II)/ YN720/ YN560 IV/ YN660/ YN560 III.3. Supports Optical Transmission Wireless Slave FlashIn optical transmission wireless flashing mode, YN685EX-RF can be set as a slave unit to receive optical transmission wireless triggering signals from YN320EX or from S\u0027 flashes, such as HVL-F32M, HVL-F60RM, HVL-F60M, performing off-camera TTL mode flashing.4. Other Practical and Powerful FunctionsGN60(ISO100,200mm); supports TTL/M/ Multi modes, up to 1/8000s High-Speed Sync, auto zoom and manual zoom, 2s recycle time; the flash coverage can be set in the range of 20 to 200m; with large LCD display screen, standard PC synchronous interface and USB firmware update port.5. Compatible with Sony CameraCompatible with Sony MI hot shoe cameras, such as A7RIV, A7RIII, A7RII, A7R, A7III, A7II, A7, A7SII, A7SIII, A7S, A6600, A6500, A6400 A6300, A6100, A6000, A58, A99, A99II, A77II, RX10, RX10II/III/IV Cameras.Specification:Features:Built-in 2.4G Wireless Trigger SystemCan work as a master or a slave unit, and fully compatible with RF radio triggering signals from other YONGNUO' speedlite. Supports 16 transmission channels and 10000 wireless radio ID, which makes it easy for multi-flash lighting.Supports Multi-group Flashes Independent ControlWhen as a master unit, the camera flash is able to control 5 independent groups to realize remote control of flash mode, flash output and focal length for YN650EX-RF/ YN685EX-RF/ YN320EX/ YN685(II)/ YN720/ YN560 IV/ YN660/ YN560 III.Supports Optical Transmission Wireless Slave FlashIn optical transmission wireless flashing mode, YN685EX-RF can be set as a slave unit to receive optical transmission wireless triggering signals from YN320EX or from S' flashes, such as HVL-F32M, HVL-F60RM, HVL-F60M, performing off-camera TTL mode flashing.Other Practical and Powerful FunctionsGN60(ISO100,200mm); supports TTL/M/ Multi modes, up to 1/8000s High-Speed Sync, auto zoom and manual zoom, 2s recycle time; the flash coverage can be set in the range of 20 to 200m; with large LCD display screen, standard PC synchronous interface and USB firmware update portCompatible with Sony CameraCompatible with Sony MI hot shoe cameras, such as A7RIV, A7RIII, A7RII, A7R, A7III, A7II, A7, A7SII, A7SIII, A7S, A6600, A6500, A6400 A6300, A6100, A6000, A58, A99, A99II, A77II, RX10, RX10II/III/IV Cameras.Specifications:Brand: YONGNUOModel: YN685EX-RFCircuit Design: lnsulated Gate Bipolar TranslatorGuide Number: GN60 (ISO100, 200mm)Flash Mode: TTL, M, MultiTrigger Mode: set-top, radio master, radio slave, wireless optical slave (Ss, s1, S2)Lamp Head Zoom Range: 20, 24, 28, 35, 50, 70, 105, 135, 200mmPower Supply: 4 * AA batteries (NOT included)Light-emitting Times: 100~1500 times (using AA alkaline batteries)Recycle Time: about 2sColor Temperature: 5600KFlash Time: 1/200 second ~ 1 /20000 secondFlash Control: 8 levels of brightness control (1/128~1 /1), a total of 22 levels of fine adjustmentExternal Interface: Hot shoe, PC interface, external charging interface, USB interfacePacking List:1 * Flash1 * Mini Stand1 * Storage Bag1 * Users Manual(English)Package List:1 * Flash1 * Mini Stand1 * Storage Bag1 * Users Manual(English)