The JTL SL-400 is a Mobilight Kit. The kit contains Mobilight 401 Unit, 800 Air Cushioned Stand, 33" White Umbrella & 24" S/W Reflector. The JTL Mobilight is designed for on-location and studio photographers. The Mobilight series can vary its power source. It can draw its power from either a battery or an electric outlet, so it is not bound by the physical limits of a wire or cord.