OUR VERDICT

Monster’s SuperStar BackFloat offers a unique and water-friendly twist on your average Bluetooth speaker, but the results sink it. The inconsistent sound performance across genres, average battery life and high price prove that you should look elsewhere.
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https://www.techradar.com/reviews/audio-visual/hi-fi-and-audio/hi-fi-and-av-speakers/monster-superstar-backfloat-1293410/review