Categories Capacity: 1.8 inch 20GB HDD Interface: High speed USB 2.0 (compatible USB 1.1) Photo viewer: JPEG format Video : MPEG-4 with MP3 near DVD quality ,AVI/MPG/DAT/VOB file format. Compatible XviD and DivX 4.0 & 5.0, Audio: MP3 WMA Built-in stereo speaker Audio recording: Stereo MP3 format Battery playing hours: Approx 20 hours for music or 5 hours for video Power source: Rechargeable, Detachable 3200mAh Li-Ion Battery. Dimension: 131 X 77 X 23 mm Weight: 265g System requirements: PC: Pentium II 400 MHz or higher, Windows 98 SE, ME, 2000 or XP. 64 MB RAM (128 recommended) with USB port and CD-ROM drive. MAC: 9.2 or X(10.2.4) USB Manager version 1.1 or higher with USB port and CD-ROM drive Display: 4.0" TFT LCD(16:9) Accessories: USB 2.0 cable, Stereo headphone, Installation CD, Manual, AC adapter.