The Sony NWX-B183 is a digital media player allows its users to store up to 900 songs on its 4 GB built-in memory module. This media device offers a battery life of up to 20 hours accounting for prolonged hours of uninterrupted music. It features FM recording, Direct USB, Bass boost and Drag and Drop Transfer for added convenience. In addition, this compact model with a weight of 30 gram is portable and convenient to carry around.