For volume shippers looking for the most economical ground delivery, Parcel Select is the best option available. As of January 27, 2013, Parcel Select was split into Parcel Select, for online purchasing, and Standard Post for purchasing at the Post Office. Parcel Select is significantly cheaper than Standard Post.
Pocket door. A pocket door is a sliding door that disappears, when fully open, into a compartment in the adjacent wall. Pocket doors are used for architectural effect, or when there is no room for the swing of a hinged door. They usually travel on rollers suspended from an overhead track, although some also feature tracks or guides along the floor.
Doorbell buttons: A convenient means of completing the circuit, located and mounted on the outside of an entrance to the home, may be used at one door or at 2 entrances. 2 wires are hooked to connectors of the button assembly, when the button is pushed, the contact is closed and thereby making an electrical connection between the 2 wires, and the connection is broken when the button is released.