Sony IC Recorder AAA Battery USB 4GB, Compatible, ICD-PX240, 2.0

With 4GB of built-in memory, the maximum recording time is approximately 1,043 hours. *When recording in LP mode (MP3 mono 8kbps) Equipped with a "noise cut filter" to reduce noise. With "Digital Pitch Control" support, playback at faster or slower speeds can be adjusted to produce a more natural pitch (0.5x speed - 2x speed). 2 x AAA batteries