There is provided a portable device (2) for wirelessly communicating with a remote mother device (4). The portable device comprises a power source (6) chargeable by a power supply (8) separate from the portable device. The portable device is configured to have a plurality of coupling states associated with the power supply. The power supply is separate from the device and remote from the further device. The portable device also comprises communication apparatus (10) wirelessly connectable to the mother device and configured to enable the portable device to have a wireless connection state associated with the further device. A processor (12) is configured to monitor a change between a first and a second of the said coupling states； and, output data for changing the connection state based upon the change from the first coupling state to the second coupling state.
