The Blue2 FT has two built-in switches, one blue and one yellow. These switches can be used to active two independent functions in any of the six keystrokes available. The keystrokes available are <Space><Enter> 1, 2,3, 4. You may also opt to connect an alternative switch to the Blue2. This can be done by using either (or both) of the 3.5mm connections on the back of the Blue2.
Please note: any switch that is connected to the Blue2 FT will emulate the same function as the built-in switches. They cannot be assigned independent functions.