Occurrence of secondary resonance in a dynamic damper device of a lock-up device is inhibited to improve effectiveness of the dynamic damper device. The system includes a data store component to store the multimedia content and to associate the multimedia content with a called system. The developer housing section houses a developer and the developer supplying section supplies the developer to a photosensitive member and houses a developer carrying member that extends in the width direction and is rotatably supported by the first side wall and the second side wall. The operating unit comprises a control panel for controlling a drive unit of the adjustable seating furniture.