The Sony NW-HD1 20GB Network Walkman Digital Music Player weighs less than 4 ounces making it an extremely compact design - built with a 1.8-inch, 20GB hard drive. Music lovers will be able to store up to 13,000 four-minute songs recorded at 48 kilobits per second on this cool little player that fits comfortably into the palm of your hand, and is easily carried in a pocket or purse. It houses an internal rechargeable battery that provides up to 30 hours of continuous playback. Accessing music on the Network Walkman player is as easy as a click of a thumb. Sony's Jog Dial navigation lets you quickly retrieve tracks and playlists on the seven-line backlit LCD display. Four different display modes offer the flexibility to navigate through track numbers, bit rates, song titles, artist names and more. The Player connects to a compatible computer via a USB 2.0 digital interface for high-speed music transfers. It comes bundled with SonicStage version 2.1 software, which makes it easy to import, manage and transfer music collections. With SonicStage software, playlists or track information created in the jukebox can be automatically transferred to the device. Additionally, SonicStage jukebox supports and seamlessly converts many Internet audio formats, including MP3, WMA and WAV files. PRODUCT FEATURES : Outputs: Headphone (Stereo Mini Jack), Line Out; Input: USB Cradle Connector Power Requirements : Embedded Rechargeable Lithium-Ion Battery Battery Life (Estimated) ATRAC3plus Audio Playbaxk: Up to 30 Hours with Embedded Li-Ion Battery Weight: 3.8oz (110g) Approximate Dimensions : (WXHXD) 3 5/8" x 2 1/2" x 9/16" (89.0 x 62.1 x 13.8mm). Supplied Accessories : NW-HD1 20GB Network Walkman Digital Music Player SonicStage Software Headphones Carrying Pouch USB Cable USB Cradle AC Power Adaptor. Shipping Weight: 3 lb