After work you put the mouse in the docking station to recharge it. The docking station is both RF receiver and recharging station at the same time. It is connected to your computer's USB port to transmit the mouse signals and the AC adapter to recharge the mouse batteries. The AC adapter is not required for operation of the mouse.
What I find very nice is that the mouse comes charged out of the box. No need to wait for your new toy to be charged.
The button in the middle of the Docking station is a reset button. This made me worry a bit, but during all testing I experienced not a single crash/hang or similar.
Nothing special here. Just a standard AC adapter with a 100-240V input range which should make it compatible with every power plug in the world.