1 Fuction:: Support High-speed Sync HSS / RT System / USB Firmware Upgrade. 2 Fuction:: Suits for Canon Commander ST-E3-RT and YONGNUO YN-E3-RT. 3 Fuction:: Support Wireless Op. Производитель: YONGNUO. Размер модели: YN600EX-RT + 8GB SD Card. Упаковка: Да