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,Canons 600EX-RT\ST-E3-RT Wireless Signal One YN968EX-RT can be used as master unit to trigger YONGNUO YN600EX-RT,Canon 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 YN968EX-RT, YN600EX-RT, YN-E3-RT, Canons 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 TTL flash, manual flash, multi flash and Gr grouping flash, supports high-speed sync , 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. Supports 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. Supports 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. Settings Save Automatically, Supports Custom Functions (C.Fn), Personal Functions(P.Fn). Ultrafast Charging Recycle System, Supports External Power Supply Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface *The transmission distance may be shorter depending on the conditions such as the positioning of slave units, the surrounding environment and weather conditions.