One battery is used by the remote, another rests in the device as a spare, ready for use. The USB receiver tucks neatly into the battery compartment when not in use.
As a presentation navigation tool, the remote works as you would expect, and well; Good range, good response time, and the embedded laser pointer is quite useful for highlighting items.
As a remote mouse, it fails to deliver; The joystick controller is overly sensitive to pushing in some directions, and not sensitive enough in others; There is little to no feedback from the stick to indicate you are pressing properly; The joystick control could use some improvements