Dont be suprised by an inoquous intruder. See the man at the door within the safe boundries of your home. Talk to him without exposing yourself directly to the visitor on the PHOENIX Door Phone.Permit him to enter only after ascertaining the credentails of the person.
Use an electronic lock for added security.
Also, keep a record of the pictures of the visitors, when you were away at work/ on vacation. Live a happy and a safe life under the PHOENIX security umbrella.