YONGNUO YN685 GN60 2.4G System ITTL HSS Wireless Flash Speedlite with Radio Slave for Nikon DSLR Cameras ?Wireless System?Fully Compatible with YN622N / RF603 Wireless Flash System ?Remote Control?Supports Remote Control the Parameters of Each Flash Group ?Extended Display?Used as YN622N II control panel and LCD panel ?HSS?Supports High-speed Synchronization ?High Guide Number?GN60@ISO100,200mm ?Charging Recycle?Ultra-fast Charging Recycle System, Supports External Power Supply