Using the SHR-7 K4 receiver fitted into the vehicle, up to 3 functions can be controlled wirelessly with the SHT-7 C hand-held transmitter and up to 7 functions with the SHT-77. Typical applications include opening and closing electric doors, extending and retracting access ramps for wheelchairs, opening and closing courtyard gates and garage doors or calling lifts. The user requires only a hand-held transmitter and can then control the spatial environment independently. Typical applications are the opening and closing of electric doors, the extension and retraction of ramps for wheelchairs, opening and closing of gates or requesting of elevators . The user only needs a transmitter to control its spatial environment with it.