The Pioneer DJ DDJ-FLX4 is a simple, but professional DJ controller. It's a 2-channel DJ controller, which means you can mix 2 separate audio sources. You can connect your smartphone, tablet, or laptop and use the included DJ software Rekordbox and Serato DJ on these devices. With the built-in effects in the DJ controller, you can make a new mix. Choose a bundle with speakers if you want to listen your new mix right away. If you're performing live for an audience, go for the bundle with the headphones and speakers. with the headphones, you can prepare your mix before the audience hears it.