Sony NW-E75 256 MB Network Walkman Digital Music Player Ultra-Compact design fits comfortably into the palm of the hand or is easily carried in pocket or purse (1.5 x 2 x .75 inches, W x H x D) 256 MB built-in memory stores up to 170 songs (4 minutes per song at 48 kbps) 1 AAA battery provides up to 70 hours continuous playback (with ATRAC3 audio playback) Compatible with ATRAC3, MP3, WMA, and WAV audio files; connects to USB port for high-speed data transfer Supplied music-management software lets you import, manage, and easily transfer your digital music collections