The Harman Kardon Onyx Studio 9 is a portable, wireless Bluetooth speaker offering high-quality audio performance with a focus on design and portability. It features a stylish design, superior sound with a wider soundstage thanks to Constant Sound Field technology, and is equipped with a built-in battery for up to 8 hours of playtime. The speaker also offers Bluetooth streaming, self-tuning for optimal sound, and the ability to pair with other Onyx Studio 9 speakers for stereo sound.