This is not a landline telephone. This is a digital phone that requires a Samsung IDCS Telephone System. It is not a standalone phone and will not work in a residential or analog environment The iDCS-18D phone requires an iDCS Telephone System in order to function. If you do not have a Samsung iDCS Telephone System - This phone will not be able to be used. This phone does not come with and does not require a power supply Adjustable LCD panel with 32-character display (2x16)