Sony ICD-PX240 Digital Voice Recorder is built in 4GB Memory and Monaural Microphone. This voice recorder has AAA x2 type battery, Dry Battery ( Alkaline, Size AAA ), MP3 playback and recording format. In this voicer recorder, Record MP3 audio and play it back through a 300mW speaker, Long battery life enables up to 32hrs recording (MP3 8kbps), 4GB of memory lets you store up to 1043hrs (MP3 8kbps). This voice recorder has Headphone Jack, Microphone In, USB Port interface.