The new models of MD Walkman have attained extremely small size and lightweight through the development of a new optical pickup that has fewer components and through further integration of electrical circuits. This Jacket Size MD Walkman Player slips easily and securely into jacket or coat pocket and is easy to hold and carry. It features Easy Pop-Up Eject Mechanism that ejects the MiniDisc media and allows easy insertion and removal while on the go.Shock Resistant Memory resists bumps or vibrations while the laser scans ahead on the disc for virtually skip-free playback. Digital Recording Level Control allows you to manually achieve a consistent recording level on your MiniDisc no matter what the source of your recording. Up to 48 hours of battery life with 1 Sony "AA" Alkaline Battery is made possible by advanced technology that allows extended battery life beyond previous limits. Digital Mega Bass Sound System provides rich, deep bass tones with digital signal processing for virtually inaudible harmonic distortion.