Poly is the new name for the combined Polycom / Plantronics. This is by far the cheapest price I've seen (next closest is $700), and while still more expensive than most 4K webcams, this also includes high quality soundbar - useful for laptops that sound like a Fisher Price toy - and features like auto-framing and the ability to automatically track/follow the speaker, so it's ideal for presenting.
There's plenty of marketing waffle on the website along with specs so I won't repeat it here, just click the link or google it if you want to know all the details.
Would the mic be able to pick up a person talking from 3-4 meters away in a conference room?