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I had bought the cosmos elite that came with two base stations and bought two more for my brother. Out of the 4 base stations 1 has this odd rotary sound struggling like a fishing rod that just annoys me, I may have to return it.
If you plan to play vrchat, 2 base stations is all you need but yes the software can support 3 but the 4th one would have issues getting in sync making the software tell you that you have two many base stations and to only use two.
You have to place these opposite from each other and press the channel button located on the back, to set one to channel (b) and the other to (c). I'm not sure what channel (A) is for but I'll have to Google it.
It's good I like it. Works good with vrchat. Setting up is pretty easy I can say. Had to remain calm and follow the instructions. Something about having it plugged in with USB to computer then holding down the bottom in the back and then while plugging in the power cord. Then it should prompt you to update.