Ideal for listening to music while exercising, travelling, or just spending a day on the go, this blue Sony Walkman NWZ-B163 has a built-in clip which allows the 4 GB digital media player to be easily attached to nearly anything, so there is no need for a case or cumbersome armband. Among other features, the Sony Walkman MP3 player has a super-fast quick-charge capability which takes only three minutes from any USB port, ideal for short periods of listening. This Sony Walkman MP3 player can also accept a full 70-minute charge to provide up to 18 hours of music playback. In addition, the Sony Walkman NWZ-B163 has a built-in microphone, which makes the 4 GB digital media player ideal for recording lectures, personal memos, and much more while adding to its overall functionality. Boasting a bright three-line LCD display that displays song information for the listener's convenience, the Sony Walkman MP3 player has easy-to-use controls as well.