【Built-in 2.4G Wireless Trigger System】Can work as a master or a slave unit, and fully compatible with RF radio triggering signals from other YONGNUO' speedlite.
【Supports Multi-group Flashes Independent Control】When as a master unit, the camera flash is able to control 5 independent groups to realize remote control of flash mode,
【Supports Optical Transmission Wireless Slave Flash】In optical transmission wireless flashing mode,
【Other Practical and Powerful Functions】GN60(ISO100,200mm); supports TTL/M/ Multi modes, up to 1/8000s High-Speed Sync, auto zoom and manual zoom, 2s recycle time;
【Compatible with Sony Camera】Compatible 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.
Features: 【Built-in 2.4G Wireless Trigger System】Can 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 Control】When 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 Flash】In 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 Functions】GN60(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 【Compatible with Sony Camera】Compatible 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: YONGNUO Model: YN685EX-RF Circuit Design: lnsulated Gate Bipolar Translator Guide Number: GN60 (ISO100, 200mm) Flash Mode: TTL, M, Multi Trigger 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, 200mm Power Supply: 4 * AA  batteries (NOT included) Light-emitting Times: 100~1500 times (using AA alkaline batteries) Recycle Time: about 2s Color Temperature: 5600K Flash Time: 1/200 second ~ 1 /20000 second Flash Control: 8 levels of brightness control (1/128~1 /1), a total of 22 levels of fine adjustment External Interface: Hot shoe, PC interface, external charging interface, USB interface Packing List: 1 * Flash 1 * Mini Stand 1 * Storage Bag 1 * Users Manual(English)