Yongnuo Digital Speedlite YN560 IV Wireless Flash Canon Nikon Pentax Olympus Fantastic condition Youngnuo flash unit. Wireless model working from 2.4ghz. Can operate other remote flash units from this one. Uses 4 AA batteries, not included. Tested and working. Manual available on Youngnuo's website. We have two units in similar great condition available. This sale is for 1 unit only. Gently pre-owned. Appears new with little or no marks of usage. Tested without fitting to a camera. Unit boots and test flash functions. Quite nice overall.