A near-field communication device includes: a processing module and a first antenna arranged in a first near-field communication area and connected to the processing module; a first presence detector arranged in the first area; a second antenna arranged in a second near-field communication area, the first antenna and the second antenna being electrically in series and forming a circuit of antennae; a second presence detector arranged in the second area; and a control circuit designed to place the circuit of antennae into at least two different operating modes: a) a first mode, termed ‘functional mode’, in which the circuit of antennae allows near-field communication, and b) a second mode, termed ‘dysfunctional mode’, in which the circuit of antennae does not allow near-field communication.