It lets you wirelessly stream audio from Bluetooth-enabled devices.

“Surround sound system” and “affordable” aren’t words you often see together, but with the Z606 Logitech has put immersive audio within grasp of modest budgets. The Bluetooth-enabled 5.1 system delivers 160 watts of peak power and can pump out sound from TVs, computers, mobile devices, Blu-ray/DVD players, and video game consoles. It’s not audiophile quality—and for just $130 you wouldn’t expect it to be—but it’s a low-risk upgrade from your devices’ native speakers.
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https://www.pcworld.com/article/3384744/logitech-z606-51-surround-sound-speaker-system-review.html