Extended Description This Audio Door Entry System is ideal for people who want to identify callers at the door BEFORE letting them in. Full 2 way speech between the outside panel and internal handset. Outside panel is weatherproof and is constructed from metal offering Anti-vandal properties. System allows operation of an optional lock release from handset. # Outside Panel # 5 Wire Installation # Lock Release Button on Handset # Wiring Diagram / Instructions Included # Lock Release NOT INCLUDED # Ideal for Elderly, Infirm, Office or Flat for example Price £129.99