YONGNUO YN600EX-RT series flashes. YONGNUO YN-E3-RT Transmitter. Canon 600EX-RT flashes. Clear LCD Display - Easy-to-read backlit screen shows all your flash settings at a glance. High-Speed Sync (HSS) - Enables flash sync up to 1/8000s for shooting with wide apertures in bright conditions.
eBay