The invention concerns a voice correspondence object comprising a sound recording medium such as a magnetic tape (2), a read/write head (3), an electronic device (21, 25) connected to the read/write head for recording sound on the recording medium, a speaker (24), a driving mechanism (4, 5, 6) for the magnetic tape and a spring (7) for moving the driving mechanism when it has been wound, and a current generator (18) powering the electronic device and driving means (5, 6) for the generator driven by the spring when the latter is wound.