1.MP3 and WMA Digital Music Playback 2.Negative LCD with Backlight 3.Built-in SD / MMC Slot 4.Clock Alarm Buzzer or Music 5.FM PLL Tuner 6.10 Radio Station Memory 7.4-Digit Clock Display,AM/PM and 24hrs 8.Red and Blue LED Display 9.Built-in Stereo Speakers (2W) 10.USB 2. 0 11.Plug and Play for Windows 98 Upwards 12.Power by: 4 x AA battery, through USB or optional AC adaptor 13.Size: 7cmx7.5cmx7.5cm weight: 350g