Profoto 901053 D1 Studio Kit 500/500 Air Black D1 Studio Kits include: 2- D1 units, 2-D1 Small White Umbrellas, 2-D1 Light Stands, 1-D1 Studio Kit Case and either Profoto Air Remote Built-in reflector 7 f-stop power range Short recycling times Short flash duration Connect to your PC or Mac with Profoto Studio Air software