From the Manufacturer
Shock Resistant Memory resists bumps or vibrations while the laser scans ahead on the disc and stores 40 seconds of music in memory, for virtually skip-free playback. Dual Headphone Jack allows use of the Remote Control unit while listening to MiniDisc in your vehicle, and also lets two people at the same time share the enjoyment of Digital sound from the MD Walkman. Digital Recording Level Control allows you to manually achieve a consistent recording level on your MiniDisc no matter what the source of your recording. Internal Battery Compartment holds one "AA" type battery so there is no need for an external battery case. "AA" Type NC-WMAA Rechargeable Battery is supplied, and offers great savings and convenience over disposable batteries.