1.LCD Display: blue backlight 2.Suppotr MP3 and WMA format 3.Electronics disk: mobile storage support 4.Voice recording: high-quality recording (36 hours of recording) 5.Equalizer Mode: 7 different modes 6.Battery: can play more than 12 hours with one AAA battery 7.Size: 7 x5x2cm (LxWxH) 8.Weight 32g (without battery) 9.Operating System Windows 98/Me/2000/XP