Telephone Entry Intercom System with Decorative Slim Door Phone Integrate doorphone with an existing home telephone without extensive installation Easy operation - lift any phone handset to talk to a visitor and press '0' to open Door or Gate Open from your phone Electric Door Strikes, Magnetic Locks, Gate openers Receive a call and talk with visitors at the door without interrupting your ongoing phone calls Calls from Door/Gate have a distinctive ring or a call waiting tone if received during phone call