A communication jack that withstands insertion of a communication plug with which the jack is not configured to mate without being damaged. The oil is supplied from the primary valve to the balance oil chamber through the balance oil line. The first new player is allowed to select the electronic waiting list using the remote device and place themselves on the electronic waiting list for the gaming table via the remote device. A packet data transmitting system for packet service domain is also disclosed, which can prolong the time window for confirming a PDU record in the SN window. The second focus activating unit controls the voice coil motor to drive the lens to replace to the initial position and then move the lens from the initial position to the focusing position again for achieving a second time focus. Also provided are methods of using said extracts to achieve an estrogenic effect, especially in a human, e.