This is a Comet 300W monoblock strobe. It's old, but I think it's still usable. I've tested it and it fires. The modeling light (100W tungsten type) has also been confirmed to work. The reflector has a hole for an umbrella shaft, so you can use an umbrella as is. Note: A remote cord is not included. You will need to obtain one yourself (CX sync cord, which the manufacturer confirmed is still available), or use the optical slave function. This allows the strobe to detect the light from another strobe controlled manually and fire in sync. Full power recycle time: 2.5 seconds (according to the manufacturer's specifications)