Looks like old stock/discontued product. I needed a Poly/Plantronics BT600 adapter because I lost mine. New compatible ones shipped to Australia are more than $100. This is a smallish speaker with the adapter included.
As long as you don't mind USB A (or just buy a $10 USB-C to A adapter) this speakerphone is great in itself. It does audio over USB, so you don't have to have it charged. Audio quality is great for the size and call/mute buttons work with Teams. Big blue and red LED to indicate if mute is on.
Adapter pairs with other Poly/Plantronics bluetooth headphones (tested)
Eager to try video conferencing without a headset. Can't go wrong at this price.
Ordered - thanks