The Pioneer DJ DDJ-400 is a 2-channel DJ controller with a USB connection, featuring touch-sensitive jog wheels and a variety of effects. Thank you for viewing. The exterior shows signs of use and aging, including scratches and dirt. As this is a used item, the main body shows scratches and dirt from use. I was able to confirm that it powers on and is recognized when connected to a computer via USB. I have not been able to check all the functions due to the many features. Please consider the current condition as is.