【Features】GN60@ISO100, 200mm, supports TTL, M, MULTI and Gr flash, the highest sync speed is up to 1/8000s, supports USB Firmware Upgrade, Real-time Display of Battery Remaining Capacity, Power Zoom, Auto-save, Custom Function (C.Fn), Equipped with Big Size LCD Display Screen, Battery built-in Protective Circuit, Ultrafast Charging Recycle System. 【Compatible with Canon Wireless RT System】In wireless radio transmission flash shooting, one YN690EX-RT can be used as master unit to trigger YONGNUO RT speedlites and Canon RT speedlites, and remotely control the flash mode and flash intensity of the slave unit. One YN690EX-RT can be used as slave unit to receive wireless signal from YONGNUO RT speedlites and Canon RT speedlites, and realize remote TTL/M/MULTI/Gr flash. 【Supports Wireless Optical Master Function】In wireless optical shooting, YN690EX-RT can be used as master unit to trigger YONGNUO EX speedlites (except YN585EX)and Canon EX series speedlite, and realize wireless flash in TTL/M/MULTI mode. 【Supports Wireless Optical Slave Function】YN690EX-RT suports receiving wireless master signal from Canon speedlites or Nikon speedlites, and it supports S1 and S2 flash mode. 【2000mAh Li-ion Battery】The battery adopts Type-C direct charging design, charging is more convenient. YN690EX-RT is equipped with 2000mAh Li-ion battery, which makes YN690EX-RT fires at least 600 times in full power possible. YONGNUO YN690EX-RT Camera Flash for Canon, TTL HSS 1/8000s GN60 Wireless Flash Speedlite, 2000mAh Li-ion Battery with Type-C Charging Interface, Support Optical Master and Slave function