The structural useful model relates to devices for preventing unauthorized penetration of on object, i.e. to devices, providing, transmission and presentation to consumer information about illicit intrusion on guarded objects to clients, for example, flat and other similar objects real estate, and can also be used on the vehicles. In particular, the structural useful model relates to devices with the use of cellular communication system gsm. Cellular security alarm door comprises signal cellular telephone with keys, equipped with mechanism pressing keys phone, the subscriber' s mobile telephone, sensor of the signal of warning, intended for location on object, contact element, electromagnet and power supply unit. Contact element and electromagnet are structurally incorporated with signal cellular phone and mechanism of pressing keys of said phone. Contact element is arranged with the possibility of interaction with mechanism pressing keys cellular telephone. Sensor of signal notifying acts on mechanism pressing keys signal phone by means of the electromagnet. At insignificant change of circuit proposed technical solution can be used not only as security, but also for checking deviations various parameters from their normal values in various production processes, for example, for checking deviations of temperature and pressure of water in tubes boiler. -Diffusion lu reliability and efficiency of protection of objects at simultaneous provision of maximum convenience.