Canon Speedlite 600EX-RT flash, in excellent condition.  This powerful flash for Canon cameras covers a focal length range of 20-200mm, and down to 14mm with the extendable wide panel.  2-way wireless communication facilitates combination with off-camera flash and ensures complete E-TTL II/E-TTL control with compatible units.  this flash also has manual controls, and an AF-assist beam for focusing in difficult lighting conditions.