The headset can be paired with more than one bluetooth device, but can only use one at a time (for example: can be connected to either a phone or a tablet with bluetooth, but not at the same time).
-but-
If you are connected to the base station as one input (2.4GHz connection), I believe that you can also be connected to one bluetooth device at the same time (for example: gaming on your PC through the base station while also connected to your phone to receive calls)