The QUICKTRACK audio products from Protech Audio are designed to provide professional audio performance in a cost-effective utility package. Each of the new products is designed with features required in most audio applications. The Model MX411 has one line input, one microphone input, and a line output. The inputs have adjustable gain. Both inputs may control relay activation. Adjustable threshold and dropout delay. Both inputs, and the output are electronically balanced. The line input and output may be used in either a balanced or unbalanced configuration. Requires low voltage AC power. 4.5" mounting extrusion supplied.