With a lightweight magnesium body and an exceptionally small digital amplifier, this portable CD player delivers hours of finely tuned music in the thinnest component possible. Most portable audio devices use analog amplifiers, which require more weight and bulk, but the digital version on this device is 80% more efficient than its larger cousins, so it takes less space and less energy to produce the same signal. The player weighs a mere 4 oz., and runs for up to 100 hours on a full charge of its rechargeable battery. It also plays MP3s, allowing you to customize playlists on your PC and burn a CD of the songs to take with you. It comes with easy-to-use software to manage and compress MP3 files, allowing up to 490 songs to fit on a single CD. A slim remote on the headphone cable fits comfortably in the hand, allowing control of all operations using only a thumb, while the parametric equalizer gives extremely precise control of audio output. Includes carrying case and one AA rechargeable battery (with charging stand and AC adapter). 5" Diam. (4 oz.)