Main features: *Crimes and time display by LCD *Intelligent learning codes to *facilitate increase and *decrease configuration *Long-distance alarm site monitoring and calling by telephone *Automatic dialing stored phone numbers *High-loudness speaker alarming on site *Guard arrangement, evacuation, muting and emergency call controlled by telephone *Automatic sound recording *Long-distance host control by telephone, to achieve the funtion of a remote controller *Automatic AC/DC switching *Police center is accessible through network