2.1CH high-power amplifier use for iPod iPhone,USB/SD/Display(Optional) with CE,ROHS ... MT-1608B, 2.1CH high-power amplifier use for iPod iPhone,USB/SD/Display(Optional)Wooden itower Speaker ... SPK.,4/. Built-in subwoofer on the base, 2.1CH system. 5/. Chargeable for iPod/iPhone, center control and full function ... 20ft: 330 PCS 40ft: 680PCS 40HQ: 780PCS Speaker Tower use for iPod iPhone,45W