YONGNUO YN-622C-TX Wireless TTL Flash Controller Transmitter for Canon

About the product
1. 3 groups (means that you can control up to 3 flashes that has YN622C attached).
2. Mix TTL, remote manual, and super sync groups
3. Individual 1/3rd stop manual power and FEC adjustment
4. Remote flash zoom in 3 groups, and auto zoom
5. 2nd curtain sync, HSS, super sync
6. USB port for firmware updates
7. AF assist light
8. Remote shutter release function (there is two cables to connect the unit to your camera)
9. Dedicated buttons for fast adjustments
10. Battery level indicator
11. PC sync port
12. 7 channels
13. Improved stability and transmission speed
14. Super sync manual timing adjustment by group (for supporting some studio flashes).
15. Flash value lock function (FVL)
16. Modeling flash & red-eye reduction flash
17. Settings saved automatically
18. PC port input
19. Up to 100m range
20. Basic trigger mode for non Canon cameras (with standard hotshoe, max sync speed is 1/250s)