A pad for supporting the head and neck of a supine patient during medical imaging, wherein the pad produces either flexion or extension of the cervical vertebrae. The battery pack is adapted to maintain electrical connectivity with the device, once unlocked, during counter-rotation and before removal. While displaying the first video stream on the display, the device preloads at least a portion of one or more non-displayed video streams based on the bandwidth allocation. In order to achieve the most even possible flow speed of the treatment fluid at the fluid delivery openings, the throughput of the fluid channel for the treatment fluid reduces continuously from the fluid feed opening in the longitudinal direction of the housing andor before the delivery of the fluid from the fluid delivery openings a storage chamber is provided. A ball control unit changes the movement result of a ball by batting, according to the period from the starting timing of the pitching movement until the starting timing of the preparation swing, and the starting timing of the batting swing. A main spring is secured to a pivot pin and connected to a main pivot bracket on the vehicle to provide a counterbalancing force on the balance link that assists in lifting the top stack linkage as the convertible top is retracted and extended.