Surveillance device comprising: - an electrical power supply system intended to be connected directly to an electrical mains system, - a communication system intended to communicate with an operating center and/or with user devices (T, AP, PC, R), - occupancy sensors intended to detect an intrusion in a surveillance area where the surveillance device is installed, - an alarm device intended to be activated by the user to send alarm signals, - an alarm intended to admit an acoustic and/or luminous alarm, - at least one camera intended to record video and/or audio images in said surveillance area, - an audio system intended to make audio recordings in real time in said surveillance area, - a mass memory connected to the camera and to the audio system to store video and audio recordings made by said camera and said audio system, and - a control unit connected to said electrical power supply system, communication system, occupancy sensors, cameras, alarm device, audio system and alarm, said control unit being configured in such manner that, when said occupancy sensors detect an intrusion or said alarm device is activated by the user, an alarm signal is sent to at least one user device and/or to the operating center, the alarm is activated, the cameras make image recordings in said surveillance area and the audio system makes audio recordings in said surveillance area; characterized in that the surveillance device also comprises: - a masking system of the cameras, said masking system comprising masks intended to be activated by the user to mask the cameras to prevent the cameras from recording when the user is in the surveillance area; and - a geolocation system to detect the geographical position of said surveillance device; wherein said geolocation system is a GPS module connected to said control unit and integrated into the surveillance device; said communication system comprising an intercom module with a direct audio and data line configured to communicate with said operating center; said audio system is configured to generate voice activated commands and activate a hazard signalling that is sent to the operating center - an electrical power supply system intended to be connected directly to an electrical mains system, - a communication system intended to communicate with an operating center and/or with user devices (T, AP, PC, R), - occupancy sensors intended to detect an intrusion in a surveillance area where the surveillance device is installed, - an alarm device intended to be activated by the user to send alarm signals, - an alarm intended to admit an acoustic and/or luminous alarm, - at least one camera intended to record video and/or audio images in said surveillance area, - an audio system intended to make audio recordings in real time in said surveillance area, - a mass memory connected to the camera and to the audio system to store video and audio recordings made by said camera and said audio system, and - a control unit connected to said electrical power supply system, communication system, occupancy sensors, cameras, alarm device, audio system and alarm, said control unit being configured in such manner that, when said occupancy sensors detect an intrusion or said alarm device is activated by the user, an alarm signal is sent to at least one user device and/or to the operating center, the alarm is activated, the cameras make image recordings in said surveillance area and the audio system makes audio recordings in said surveillance area; the surveillance device also comprises: - a masking system of the cameras, said masking system comprising masks intended to be activated by the user to mask the cameras to prevent the cameras from recording when the user is in the surveillance area; and - a geolocation system to detect the geographical position of said surveillance device; wherein said geolocation system is a GPS module connected to said control unit and integrated into the surveillance device; - a masking system of the cameras, said masking system comprising masks intended to be activated by the user to mask the cameras to prevent the cameras from recording when the user is in the surveillance area; and - a geolocation system to detect the geographical position of said surveillance device; wherein said geolocation system is a GPS module connected to said control unit and integrated into the surveillance device; said communication system comprising an intercom module with a direct audio and data line configured to communicate with said operating center; said audio system is configured to generate voice activated commands and activate a hazard signalling that is sent to the operating center