It's a special mixer, that when fully working properly, you are ready to mix and groove with the Numark Mixtrack Platinum Controller. This quad deck controller boasts 2 channels, 1 mic input, 2 phono inputs, and 1 line input, ensuring that you have everything required to create your own music. The USB input/output ports make connecting to your laptop or PC a breeze. Ideal for DJs, this controller is perfect for any music enthusiast who wants to take their mixing skills to the next level. Whether you're a beginner or an expert, the Mixtrack Platinum Controller makes it easy to create, scratch, and mix your own music. The Mixer might need a new mixer software update or may need replacing altogether with new complete software, hence the very cheap price.