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 ... 2.1CH system. 5/. Chargeable for iPod/iPhone, center control and full function control, 6/. MDF box. 8/. design for auto switch ... 20ft: 330 PCS 40ft: 680PCS 40HQ: 780PCS Speaker Tower use for iPod iPhone,45W