Sony GTK-XB5 wireless Bluetooth speaker system , EXTRA BASS BUTTON FOR deep, punching bass, club-like LED lighting. Stream and control great sounding music from your smartphone. CAN add extra wireless speakers to the mix. It's ready to hit the party scene with bass that hits. EXTRA BASS technology delivers powerful, clear bass sound where it's hardest to find — in portable speakers. Enjoy easy, one-touch connectivity and music streaming with NFC or Bluetooth. Pump up the atmosphere with club-like line and speaker light with strobe flash. Synchronizing with the rhythm of the beat, the power and speed of the light display matches the musical mood and atmosphere. Connect two speakers together wirelessly or connect more than two speakers together with wires for a higher sound output. Have fun with your party settings from the dance floor with the SongPal APP.