Use the Pioneer DJ DDJ-FLX4 + Pioneer DJ HDJ-X5 Black as an advanced DJ because you get a lot of variation options. You connect the controller to your tablet or laptop. This way, you can use the included audio software Rekordbox and Serato Lite for various effects. With the headphones, you listen to what you're mixing. The headphones have a 40mm dome driver that allows you to hear detailed sound. Thanks to the 5 to 30,000Hz frequency range, you can hear the high and low bass tones clearly and listen critically to what you're mixing.