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I have been using this Jabra Speak 510 Plus now for a few months and having previously used a Sennheiser model can confirm that this is the best Conference device i've used.
The variant here includes a USB wifi adaptor. This is handy to remotely connect computers without Bluetooth to the device.
It also acts as an excellent quality bluetooth speaker which packs quite a punch so far as volume is concerned. I have tested it with "Thus Spake Zarathustra" by Strauss (great test of range) - it handles the volume transitions well. I've also used it for Drum n Bass & Trance music. It handles the ranges very well for such a compact device.
It's microphone pickup has quite an effective range and i have successfully used it in board room (long table) meetings of up to 12 people.
Product is pretty good. It works, is easy to set up, and it's nice and light. The background noise is much lower than the built-in mic on my laptop or ipad, and when I dial into Bluejeans on my iPad I don't have the echo that people complain about when I use my iPad mic (which is why I bought it).
The two marks against it: it has this annoying non-removable USB cable dangling off of it (can't it just have a micro USB input like everyone else?), and the microphone seems to suffer from Bluetooth interference or something in an office environment where my air pods have no problem. Maybe it's using an old version of Bluetooth? I wasn't able to find the version it uses anywhere.
I bought this for home working. I was previously using a USB headset for both my PC and mobile. It was a faff switching and having to attach a lightning adapter to use on my iPhone. Also I find that I am on long conference calls a lot. This now means I don’t have to sit with a headset on for hours at a time. Volume is loud and the audio is crystal clear. Very happy with my purchase so far.