Features: Supports N's/ C's optical transmission wireless slave flash: --One Yn568Ex III can respectively accept the master unit of Yn600Ex-Rt II, Yn568Ex II, Yn568Ex Iii, 600Ex(Ii)-Rt, 580Ex II, Sb-910/900/800/700, Nikon built-in flash C command flash and built-in wireless signal of Canon 7D/60D/600D cameras. It realizes wireless Ttl, manual flash and stroboscopic flash. Gn58@iso100, 105mm, and supports automatic manual zooming(24-105mm): --High guide number TTL speedlite, which supports Ttl, M, Multi flash and supports automatic manual zooming. The focal length can be adjusted between 24-105mm. Supports high speed sync(HSS) flash and with high speed recycling(2s) system: --The Yn568Ex III can realize TTL and manual flash, 1/8000s max. shutter sync speed; and the recycling time for full output just takes 2 seconds. Supports firmware upgrade: --The Yn568Ex III is equipped with USB interface, you can download the latest firmware from Yongnuo official website to upgrade the speedlite. Equipped with large-size LCD display and 2.5mm PC interface, and supports the battery remaining power real-time display, convenient to use.