USB 1.1 version with capacity: 128MB/ 256MB/ 512MB/ 1GB MP3/WMA playback USB interface One AAA alkaline battery play over 10 hours Operating system: Windows 98/Me/2000/XP (No driver is necessary is for Windows 2000, ME & XP) Audio port: 3.5 mm headphone jack Player Size: 2.0 x 3.1 x 9.5 cm Weight: 2.5 oz Accessories: (Original Retail Box) CD Driver Neck Strap Earphones USB cable Battery User Manual (English)