Feature: 2C OLED Graphic display Screen Skip-free mp3/wma/ADPCM playback Built-in FM radio / Voice Recorder / A-B Built-in rechargeable lithium battery Supports synchronized lyric display book reading / picture browsing 10 sorts of EQ Lock Button Multi-language Support, include Simplified Chinese / Traditional Chinese / English / Japanese / Korea / Russia / Thai Online Firmware Update specification: S torage capacity: Build-in 256M-1GB (Optional) Interface: High Speed USB Download speed : 500KB/s Screen: 2C OLED Screen , 128*64 dots Battery: Build-in 280mA Rechargeable Lithium Battery Charge time: 3-4 hours Play time: 6-8 hours Signal to Noise Ratio : 90dB Range of Output Frequency : 20Hz ～ 20KHz Output Power of Earphone : 5mW + 5mW Record Sample Frequency : 8KHz Compress Rate : MP3 8-320Kbps ； WMA 5-192Kbps Size : 64*41*8.7 mm(L*W*H) Character: use Sigmatel decode solution Tiny, Ultra-light, aluminum alloy c ase, metal oxidation for twice conveniently customize user logo due to pure metal case Order Guide: shell color: red / silver / black package: cardboard box Minimum quantity of an order: 100pcs I nquiry: need to fill in standard price inquiry form for mp3 player