An energy receiver comprising: - a power reception coil configured to wirelessly receive power from an energy transmitter; - an energy storage element configured to store the power received from the energy transmitter; - a memory being configured to store identification information of the energy receiver and to store a threshold of a Q value of the energy receiver to be compared with a measured Q value of a power transmission coil of the energy transmitter; - a communication unit to communicate with the energy transmitter to measure the Q value, and - a control unit configured -- to receive (S22) a command related to Q value measurement from the energy transmitter, -- to control (S24) switch, store charge in the energy storage element upon receipt of the command related to Q value measurement, -- to transmit (S25) and receive information related to the Q value of the resonance circuit including the power reception coil in the energy receiver and a decision result as to whether there is a foreign object, -- to receive a charging command from the energy transmitter, and -- to supply the received power to a load connected to the energy receiver upon receipt of the charging command, which is issued by the energy transmitter after no foreign object has been detected. - a power reception coil configured to wirelessly receive power from an energy transmitter; - an energy storage element configured to store the power received from the energy transmitter; - a memory being configured to store identification information of the energy receiver and to store a threshold of a Q value of the energy receiver to be compared with a measured Q value of a power transmission coil of the energy transmitter; - a communication unit to communicate with the energy transmitter to measure the Q value, and - a control unit configured -- to receive (S22) a command related to Q value measurement from the energy transmitter, -- to control (S24) switch, store charge in the energy storage element upon receipt of the command related to Q value measurement, -- to transmit (S25) and receive information related to the Q value of the resonance circuit including the power reception coil in the energy receiver and a decision result as to whether there is a foreign object, -- to receive a charging command from the energy transmitter, and -- to supply the received power to a load connected to the energy receiver upon receipt of the charging command, which is issued by the energy transmitter after no foreign object has been detected. -- to receive (S22) a command related to Q value measurement from the energy transmitter, -- to control (S24) switch, store charge in the energy storage element upon receipt of the command related to Q value measurement, -- to transmit (S25) and receive information related to the Q value of the resonance circuit including the power reception coil in the energy receiver and a decision result as to whether there is a foreign object, -- to receive a charging command from the energy transmitter, and -- to supply the received power to a load connected to the energy receiver upon receipt of the charging command, which is issued by the energy transmitter after no foreign object has been detected. <EOS>