Techniques for presenting content provided by a mobile device on a second communication device are presented. If the pulse width of the received pulse is not shorter than a predetermined value, a signal having a fixed pulse width is outputted as an output signal from a one-shot pulse generating circuit, so that a pulse having a constant pulse width corresponding to the specified communication speed is outputted. The head defines threads for threaded engagement with the circumferential rib, with a lead thread configured to pass through a scallop to allow the threads to engage the circumferential rib. Slow fading may be evidenced by persistence of the out-of-lock condition for an extended period of time.