Sony WALKMAN NW-S700 series is the world's first digital music player to feature integrated noise cancellation technology, ideal for music lovers who live in noisy city environments or travel frequently by aeroplane or train. The NW-S700 series uses new and original audio technologies to provide unprecedented sound quality. It has a 3-line floating colour OEL with cover art display and a compact, lightweight body so it can go wherever you do. Built-in noise cancellation Clear Stereo & Clear Bass sound enhancement system 4 GB Flash memory 3-line floating colour OEL display Built-in FM tuner Optimum 50 hours battery stamina Rechargeable lithium-ion battery Quick charge feature (3 min = 3 hours) Supplied with high-quality noise cancelling headphones ATRAC, MP3, AAC (non DRM) and WMA (non DRM) compatible SonicStageCP 4.1 software for easy music management and transfers of your favourite tracks Direct encoding from non-PC sources via optional recording cradle Dimensions (W x H x D): 88 x 27 x 17 mm Approx.weight: 4.7 g