Features: Equipped with LED Light Equipped with high power LED light, brightness can be adjusted, there is a built-in diffuser and a color conversion filter for the LED light. Fully Compatible with Yongnuo Yn-E3-Rt / Yn600Ex-Rt, for Canon's 600Ex-Rt / St-E3-Rt Wireless Signal One Yn968Ex-Rt can be used as master unit to trigger Yongnuo Yn600Ex-Rt, Can0n 600Ex-Rt, and live display the flash groupings of slave unit and recycling information, one Yn968Ex-Rt can respectively receive the wireless signal of master unit Yn600Ex-Rt, Yn-E3-Rt, Can0n's 600Ex-Rt / St-E3-Rt, realizing remote TTL\M\Multi\Gr flash, supports linked shooting with radio transmission. High Guide Number, Supports High-Speed Sync Gn60@iso100, 105mm, supports high-speed sync Ttl, manual flash, multi flash, Gr grouping flash, the highest synchronous speed can reach 1/8000s. Support Auto/Manual Zooming The Yn968Ex-Rt supports auto and manual zooming, the flash coverage can be changed between Auto, 20~105mm. Support USB Firmware Upgrade The Yn968Ex-Rt equipped with the USB interface, supports firmware upgrade, the users can download the upgrade firmware through the Yongnuo official website to upgrade the flash. Support Wireless Optical Slave Function The Yn968Ex-Rt supports receiving Yongnuo, Canon's and Nikon's wireless optical master signal, supports S1 and S2 flash mode. Setting save automatically, supports custom functions (C.Fn), personal functions (P.Fn). Ultra-fast charging recycle system, supports external power supply. Equipped with big size LCD display screen, standard PC synchronous interface.