A swing includes two seat units swingably connected to an upright support frame through suspending members. The dialysis machine is configured to perform a dialysis treatment on a patient while the autonomous vehicle is under the control of the autonomous vehicle control system. Therefore, a map of a volume can be determined based upon the sensing of the plurality of points without the use of other imaging devices. A thick, high hardness, synthetic foam layer is associated with the thin foam layer and occupies the pad area association with the buttocks. A receiver includes a filter stage as mentioned above; and a switching unit coupled to the filter stage for controlling a switching state of the switch, to selectively connect the antenna terminal to the second output, depending on a selection signal.