Patent ID: 7944170

Claim:
A wireless transmission device comprising: a main body comprising: a housing; a first connector associated with the housing; a transmitter within the housing, the transmitter configured to wirelessly transmit a signal for an external device; and a first battery within the housing, the first battery configured to supply power to the transmitter; a wireless receiver unit comprising: a casing formed to be attachable to the housing of the main body; a second connector associated with the casing, the second connector configured to be connectable with the first connector and with a third connector associated with the external device; a receiver within the casing, the receiver configured to wirelessly receive the signal sent from the transmitter to convey it to the external device when the second connector is connected to the third connector associated with the external device; and a second battery within the casing, the second battery configured to be charged by the external device when the second connector is connected to the third connector associated with the external device, and to recharge the first battery while the second connector is connected to the first connector.