1. Seven frequency, LDE direct 2. Support document format such as MP3, WMA and so on. 3. Have special audio input hole 4. Can use earphone to listen music directly 5. Can play MP3 directly 6. Can keep FLASH inside, from 128, 256, 512, 1GB to 2GB. 7. Have frequency and music memory function 8. Adopt PLL to lock annular circuit, release stably