The invention relates to a device (10) for monitoring an occupancy state of a parking space of a parking space, comprising a processing unit (20), a sensor unit (30) for detecting the occupancy state and a near field communication unit (40). The processing unit (20) is configured to set up a first, wireless data connection (42) to a first communication unit (101) of a first, external device (100) by means of the near-field communication unit (40). In addition, the processing unit (20) is configured to receive an activation and / or deactivation command from the external device (100) via the first data connection (42). Furthermore, the processing unit (20) is set up to activate and / or deactivate the sensor unit (30) on receipt of such an activation and / or deactivation command. The invention also relates to a parking space (140) having a device (10) according to the invention and also to a system (130) having a device (10) according to the invention and a first, external device (100) having a first communication unit (101).
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