Completely Compatible with YONGNUO 622C and 603 Wireless System YN685 II supports respectively receiving wireless triggering signal from YN650EX-RF/YN320EX/YN560 IV/YN660/YN720/YN862C/YN560-TX(Pro)/RF605/RF603(II)/ YN622C-TX/YN622C. It can easily realize wireless TTL, manual flash and stroboscopic flash. Note: The wireless TTL flash function requires the support of the main control unit. Remote Control Off-camera Parameters of Each Group The flash mode, flash intensity, focal length and sync mode (YN622C wireless system only) of the speed-lite in each group can be controlled remotely through YN622C transceiver and YN650EX-RF/YN320EX/YN560IV/YN660/YN720/YN862/YN560-TX(Pro). High Speed Sync (HSS) When HSS function is activated, this speed-lite YN685 II can be used with every shutter speed and the maximum sync speed is up to 1/8000s. Turning on the high speed sync is useful to limit the influence of ambient light when shooting in bright conditions. Supports Firmware Upgrade The YN685 II equipped with USB interface, supports firmware upgrade, you can download the upgrade firmware through the YONGNUO official website to upgrade the flash. Ultrafast Charging Recycle System, supporting External Power Supply The recycling time is 2 seconds when the power output is set to maximum. The recycling time is about 3~4 seconds even this speed-lite is used without using fresh batteries. In addition, you can use the external power supply to meet your higher charging recycle need. GN60@ISO100,200mm YN685 II is a 2.4G wireless speed-lite of high guide number, which supports TTL, M and Multi mode. Supports Auto/Manual Zooming YN685 II supports auto and manual zooming, and the flash coverage can be changed between 20~200mm. Two display themes are designed for YN685 YN685 II supports numeric theme and classic theme , you can choose the one that is suitable for you. Supports Sound Prompt Function, Custom Settings (Fn.) and Auto Save Settings Equipped with Big Size LCD Display Screen, standard PC Synchronous Interface