ITOWER AUDIO--- Piano finish painting/ built-in digital AMP/built-in subwoofer / automatically switch between left and right soundtrack channel 1. For MP3/MP4/Mobilephone/IPOD/CD/PC/TV /DVD" 2. Flip-on inside dock connector for universal sources 3. High-performance SPK 4. Built-in subwoofer, 2.1CH 5. IPOD rechargeable and entirely remote control 6. Digital amp 7. Piano finish painting 8. Subwoofer choice 9. Automatically switch between left and right soundtrack channel 10. Stand-floor ITOWER design 11. Optional fitting WP-2MIC can be used for loud-speaker and karaoke 12. SUB output /AUX/ MP3 input 13. Power: 12W x 2+30W; AC (110V - 240V 50 - 60HZ) 14. Frequency Range: 30Hz - 20KHz 15. Color: Silver, black 16. Optional HS-IT502-300 to be 2.0CH System 17. DP-6SW/YA300 /IT502-300 to be 2.1CH System 17. WP-1IB wireless blue-tooth connector 18. WP-2MIC wireless MIC