A mailbox is mounted to two perpendicular faces of a post by a mounting assembly main bracket with two perpendicular flanges. The invention provides interference temperature-adaptive waveforms, and a variety of physical and media access control protocols for generating waveforms based on measurement and characterization of the local spectrum. In some embodiments, the search results can include different response types from a provider to a consumer that can include an offer to fulfill the search request, a counter offer to the search request, or an executed purchase against the search request. A motor driving circuit and a motor normally operate a second hand in response to the low frequency pulse signal and repeats, at a period of 1 second, operation of fast feeding the second hand and thereafter stopping the second hand during a predetermined period of time in response to the high frequency pulse signal.