The YN600EX-RT II compatible with Canon E-TTL, it can be used as on-camera master unit and remote slave unit of Canon’s RT system,and supports Gr grouping mode.
GN60@ISO100, 200mm; supports HSS (high-speed sync), TTL, manual flash, Gr grouping flash, the highest synchronous speed can reach 1/8000s
YONGNUO YN-E3-RT II speedlite transmitter is a transmitter for wireless flash shooting. It can control up to 5 groups(15 units) of speedlites that have a wireless multiple flash shooting function using ratio transmission.
Flash Modes: ETTL/M/Multi/GR4/ flash modes. supports 1st curtain, 2nd curtain(Only in M mode), high speed sync. Two-way 2.4G radio communication, fully compatible for ST-E3-RT/600EX-RT/YN-E3-RT/YN968EX-RT/YN600EX-RT(II)/YN686EX-RT/YNE3-RX.
What you get: 1 * Flash Speedlite YN600EX-RT II and 1 * YN-E3-RT II Speedlight Transmitter