The E-MU 1616 (EM8970) PCI Digital Audio System is a professional-grade audio interface that provides high-quality sound processing capabilities. With one phono input and two line inputs, this PCI audio interface is ideal for musicians and audio professionals looking to capture and edit audio recordings. The powered design ensures reliable performance without the need for an external power source, making it a convenient and efficient choice for studio setups. Additionally, the E-MU brand is known for producing reliable and high-performance audio equipment, making this product a dependable choice for those in need of professional-grade sound editing capabilities.It is missing one knob does not include power supply sold separately  product has been tested independently  No returns unless product isn't as described.