Yes works for speech (it can only do speech) up to approx. 8 people tip top

Definitely the Jabra Speak 510 is suitable for MS Teams sessions. As far as I know, there are two versions for MS Teams and Skype (please check the website).
Please also consider the number of participants and the distance to the Jabra according to Jabra's specification!
For home office and small meetings, my 510 is perfectly adequate and I am completely satisfied with it. Colleagues use the slightly larger 710 and 750 versions. I don't know the difference, but they can be paired in the same way so that you can hold meetings with two 710s or 750s (practical if you have more people in meetings). However, after consultation with Jabra, they can only be paired of the same type. That means two 710s or two 750s, but not mixed.
Otherwise, please ask Jabra support! They are very nice and helpful!