... MP3 Player; 2. Built-in rechargeable lithium polymer battery; 3. Backlight LCD screen; 4. CE, FCC. Direct USB Type Bar MP3 Player ... (EM646) Features:1. Capacity: 256M,512MB, 1GB, 2GB,4GB,8GB(Optional);2. Audio format: MP3,WMA,ASF ... , and FM (optional);7. Battery type: rechargeable lithium polymer battery;8. Battery lifespan: 6 to 8 hours ... to You! Direct USB Type Bar MP3 Player (EM646)