The VX840BT 2.1 Active speaker set is easy to set-up and easy to transport. This set includes a 15" subwoofer and two 8" ABS cabinet speakers with 1" dynamic driver. The built-in BT receiver allows you to simply stream your music wirelessly from your smartphone or you can use the built-in MP3 player with USB and SD slots. This active speaker set is suitable for mobile DJs, karaoke shows, drive-in shows, presentations etcetera.