Audio and video systems for data transmission, entry phones, video intercoms, telephony including telephones, entry phone and video intercom internal and external control units, video monitoring cameras and monitors, household telephones and switchboards, intruder alarm systems and intrusion detection devices thereof such as infrared or microwave or combined technology motion detection alarm systems, sirens and visual alarms, glass breakage detection systems, door or window opening detectors, thermoregulation devices including ambient thermostats and chronothermostats and control units thereof