Enjoy premium wireless audio with the Harman Kardon Onyx Studio 9, designed to deliver rich, dynamic sound in any room. With Bluetooth streaming that allows pairing of up to two devices at once, you can easily take turns playing your favorite tracks with family or friends. The built-in rechargeable battery gives you up to 8 hours of uninterrupted playtime, making it easy to move your music around the house. Thanks to its self-tuning feature, the speaker automatically adjusts its sound based on its surroundings to give you the best listening experience wherever you place it. For an even bigger sound, you can wirelessly pair two Onyx Studio 9 speakers to create a wider stereo soundstage. With a handy USB charging port to keep your mobile devices powered and the intuitive Harman Kardon One app for personalized control and EQ settings, this speaker offers both convenience and high-performance sound in one elegant design.