The YN660 is built upon the previous YN560 IV, now providing 6 groups in the Radio Master mode, up from just 3 previously, as well as boosting power output to a Guide Number of 66 meters (ISO 100, 199mm), Other improvements include 24-199mm flash head zoom, lever locking foot, and updated buttons / main control dial.
It supports Yongnuo's full 2.4GHz manual flash control system. YN660 can act as a wireless master flash for the previous-generation Yongnuo YN560 III and YN560 IV flashes, and as a slave (with remote adjustment) to the YN560-IV YN660 and Yongnuo YN560-TX RF-603 II RF-605 RF-602. Crucially, you are able to control up to six groups of flashes.
Suitable for:Suit for All Standard Hot Shoe DSLR Camera, such as Canon, Nikon, Pentax, Olympus. .Except some Sony cameras (It needs hot shoe adapter to use the flash)
Package included:--1*YN-660Flash light;