Moller International, Inc. is engaged in designing, developing, manufacturing and marketing a range of vertical take-off and landing (VTOL) aircraft. The M400 Skycar model is under development and testing and is projected to be a four passenger aircraft that will combine the cruise performance of an airplane with the vertical-flight capabilities of a helicopter. It is designated the M400 Skycar. A related product being developed by the Company is the Aerobot line of unmanned aerial vehicles. Aerobot is the design for a line of piloted VTOL vehicles. The Aerobot focuses to carry a range of customer supplied mission specific payload packages. Payload requirements are model-specific and there are restrictions on weight, size and location. The electric-powered Aerobot employs an umbilical cord to transmit power, data and control signals, can stay aloft for extended periods (8-12 hours or to the limitation of ground-supplied electrical power) at heights of up to 250 feet.