DoorKing 1808 Telephone Entry Access System Provides service for up to 1000 residents. Led lighting illuminates keypad and directory Flash entry codes allow entry on a single day only, then automatically deactivate themselve Dtmf tone output allows these systems to be used with PBX, KSU and telephone systems with auto-attendants The DKS model 1808 is a small compact unit that is loaded with features. It's distinctive styling is ideal for small residential or commercial applications. The 1808 is available in surface mount style only. Guest are identified by voice communication via the telephone. Access is granted by pressing "9" on your touch tone telephone, or access can be denied by simply hanging up. By adding the optional built in directory, the 1808 is ideal for small multi-home gated community applications. The STANDARD UNIT comes Hands Free but a Handset Conversion Kit is available.