I HAVE USED THESE DYNALITE ELECTRONIC FLASH UNITS ON LOCATION AND IN-STUDIO SUCCESSFULLY FOR MANY YEARS. START YOUR OWN STUDIO OR ADD TO WHAT YOU HAVE. THREE (3) of the 6 are FAN-COOLED! Each tested to work. Modeling lamps included. Extension cable for each. Sync cord for battery included. Light stand on casters; honeycomb grid light modifier; assortment of used umbrellas. Educational reference books included. Smoke-free studio. Protocols in place to insure your safety. Price is negotiable.