Abstract: Card or postal media which comprises a storage member to retain audio information picked up by a microphone, a sound generating member including a speaker, a mode selection signal producing member to allow either record or playback to be selected, a controller performing record or playback according to the mode selection signal from the mode selection signal producing member; converting the audio signal from the microphone from analog to digital and storing it in the storage member when the record mode is selected; retrieving stored information from the storage member, converting it from digital to analog, and outputting the analog signal to the sound generating member when the playback mode is selected, and a card board on which the microphone, speaker, and the other members are mounted.