Features:
GN 66m (ISO 100 / 200mm)
Flash Mode – M / Multi
Manual Flash – 1/128 – 1/1 output control (1/3rd increments)
20 – 200mm Manual Flash Zoom
Built-in Radio Master Modes – YN-560 / RF-603 (2.4GHz RF Systems).
Built-in Radio Slave Modes – YN-560 / RF-603, and RF-602 (2.4GHz RF Systems).
Supports 6 Flash Groups
Supports 16 Channels
Full Power Recycle – From 3 Seconds
S1 & S2 Optic Slave Modes
Custom Functions
Auto Save Settings
Sound Prompt
Heat Protection
Large LCD Screen
360 Degree Swivel and Tilt Head
Fast Clamping Metal Foot
External HV Battery Port
PC Sync Port

Functions:
Compatible transmitter / master flash units include:
YN560 IV, and YN660 flashes
YN560-TX
RF-605, RF-603 II
RF-602
With the YN560-TX tranmitter, and YN560 IV / YN660 flashes providing the most functionality, including Remote Manual Power and Flash Head Zoom Control.

Compatible slave flash / receiver units include:
YN560 IV, YN-560 III, and YN660 flashes
RF-605, RF-603 II