One aspect of the invention provides a method for calibrating an alt-az telescope system with a latitude of an observer location. An e-mail message is sent from a user to the remote e-mail forwarding computer. The size of the primary crystallites may be at most about 0. The receiver can also have one or more lights mounted on it that can be turned on by pushing buttons on the transmitter. The method further includes forming at least one vent hole in the lid, exposing a portion of the second sacrificial cavity layer. The fixed profiles and the sliding profiles have, respectively, opposite holes and openings, through which the male elements are inserted for their blocking by the openings, through the sliding movement of the sliding profiles.