A passenger elevator is designed to carry people and small packages. Passenger elevators capacity is related to the available floor space. Passenger elevators may be specialized for the service they perform, including: Hospital emergency (Code blue), front and rear entrances, double decker and other uses. Residential elevators may be small enough for one person while some are large enough for more than a dozen. Wheelchair, or platform lifts, a specialized type of elevator designed to move a wheelchair 6 ft (2 m) or less, often can accommodate just one person in a wheelchair at a time with a maximum load of 750 lb (340 kg). Cars may be ornate in their interior appearance, may have audio visual advertising, and may be provided with specialized recorded voice instructions.