The Sony ULT TOWER 7 is a party speaker built to fill a room full of people with sound, with 420W behind it and 360° Party Sound that spreads music out in every direction. Hit the ULT button and you can move between Deep Bass, Attack Bass, Flat and Live, so the same speaker suits a slow Sunday playlist or a full-on birthday bash. Sound Field Optimisation reads the space and adjusts the audio to wherever you've set it up, while a ring of light around the grille pulses along with the beat in Beat, Wave or Mellow mode. Plug a microphone in for karaoke night in the back garden, hook up a DJ mixer through the XLR or RCA inputs, and keep the music going for up to 30 hours on a charge. Running low mid-party? 10 minutes on charge gives you another 3 hours.