A syringe that has a barrel with curvature is provided. The face cap may have one or more lenses positionable in front of the electrical light source. The wireless communication device accepts the return call based upon the emergency access class information and the priority level of the return call. In addition, the baluns are connected to the ends of the corresponding symmetrical microstrip lines, respectively. The method includes a control point extracting segment-related information about audiovideo content stored in a first AV device, and the control point controlling a second AV device to execute the AV content using the segment-related information in segment units.