YN-600EX-RT II is exactlly the same function as the Canon's best flash 600EX-RT, same functions, same power, even with same apprearance, TTL, HSS, Master

Features Information:
1. One YN600EX-RT II can be used as on-camera master unit and remote slave unit of Canon's RT system, and supports Gr grouping mode.
2. Fully Compatible with YN-E3-RT II, Canon's 600EX-RT and ST-E3-RT Wireless Signal
3. GN60@ISO100, 200mm; supports high-speed sync TTL, manual flash, Gr grouping flash; the highest synchronous speed can reach 1/8000s.
4. The YN600EX-RT II equipped with the USB interface, supports firmware upgrade, the users can download the upgrade firmware through the Yongnuo official website to upgrade the flash.
5. The YN600EX-RT II supports YONGNUO, Canon's and Nikon's wireless optical master signal, supports S1 and S2 pre flash cancel mode.
6. The YN600EX-RT supports auto and manual zooming, the zoom coverage is from 20-200mm.
7. Settings Save Automatically, Supports Custom Settings(Fn)
8. Ultrafast Charging Recycle System, Supports External Power Supply.
9. Equipped with Big Size LCD Display Screen, Standard PC Synchronous Interface.

Yongnuo YN-E3-RT II Speedlight Transmitter is compatible with the Canon 600EX-RT flash unit and ST-E3-RT transmitter, it provides practically all the features of the original Canon ST-E3-RT.
Features:
Two-way 2.4G radio communication, fully compatible with ST-E3-RT and 600EX-RT
15 Physical Channels, 1 Auto Channel, Up to 10,000 customizable photographer ID
Transmission Range: 100M
Multi YN-E3-RT II can share slave flashes
Firmware can be upgraded via USB
High resolution Dot-Matrix LCD, Back-light for LCD keys
Built-in AF Lamp, buzzer
Flash Mode: ETTL, M, Multi, GR (GR Mode only works with cameras released since 2012)
A/B/C/D/E Five groups
Supports 1st Curtain, 2nd Curtain (Only in M mode), High speed Sync