A.       Basic Functions Receive call from outdoor unit and entrance unit Remote unlock and monitor doorway Call each other with managing center Mute 8 guard-zones for security Various methods of setting guard-zones Arm and disarm by telecontroller Separate button for emergency call Hands free   B. Optional functions Support sub-indoor unit   C.       Specifications Voice S/n: ≧ 55dB Ringing: 78dBA Display mode: 4/5/506 inches, TFTLCD320*234 Talk limit: 2min Power supply: 12V DC Communication mode: base-band network Power consumption: standby 0.9W/operation 8.5W   D.      Appearance & Dimension White,silvery and champagne available Dimension(surface mount): 225*205* 48mm Dimentions(flush mount):   225*205* 12mm (outside part)                           237*217* 100mm Flush mount/super-thin surface mount