A monaural hearing device includes: a first housing accommodating a first near-field magnetic induction communication unit and a first magnetic field antenna connected to the first near-field magnetic induction communication unit, wherein the first housing is configured for placement behind an ear of a user of the monaural hearing device; and a second housing accommodating a second near-field magnetic induction communication unit and a second magnetic field antenna connected to the second near-field magnetic induction communication unit; wherein the first and second near-field magnetic induction communication units connected to the first and second magnetic field antennas, respectively, are configured to perform near-field wireless data communication with each other.