Samsung S3C 2440 processor (400Mhz) SIRF Star III high sensitivity receiver ,more20 channels OS: Based on Microsoft Windows 4.2 Multi-language support with input method Internal Lithium battery support WMV,AVI,ASF,MP3,WMA,WAV media format Txt Format Files Browser(E-book) Photo Scan: JPEG,BMP Built in speaker SD memory card expansion SD Card/Map (optional)