An apparatus comprising: means configured to provide wireless power transmission in a wireless power transmission mode, wherein the means comprises an H bridge circuitry arrangement (203, 210, 211) configured such that, in use during the wireless power transmission mode, the H bridge circuitry arrangement (203, 210, 211) self-oscillates; wherein the H bridge circuitry arrangement (203, 210, 211) comprises a resonance circuit comprising an inductor arranged in parallel with a capacitor; wherein the H bridge circuitry arrangement (203, 210, 211) comprises: a first circuit branch, a second circuit branch, and a bridged section, between the first and second branches, which comprises the resonance circuit; wherein the second circuit branch comprises first and second transistors (Q1, Q2) whose gates are coupled to one side of the resonance circuit that is connected to a node between third and forth transistors (Q3, Q4) of the first circuit branch, and wherein the first circuit branch comprises the third and fourth transistors (Q3, Q4) whose gates are coupled to another side of the resonance circuit that is connected to a node between the first and second transistors (Q1, Q2) of the second circuit branch; the apparatus further comprising means configured to provide wireless power reception in a wireless power receiving mode, wherein such means comprises the H bridge circuitry arrangement (203, 210, 211), and wherein the H bridge circuitry arrangement (203, 210, 211) is configured to rectify an induced alternating voltage; the apparatus further comprising a voltage source, first means and second means, wherein the first means is configured to selectively couple the voltage source to the H bridge circuitry arrangement so that, when the H bridge is coupled to the voltage source, the self-oscillation of the H bridge circuitry arrangement is started for operating in the wireless power transmission mode; and wherein the voltage source is additionally coupled to the H bridge circuit arrangement via the second means configured so as to prevent the flow of current therethrough from the voltage source to the H bridge, whilst enabling the flow of current from the H bridge to the voltage source so as to enable charging up of the voltage source during operation in the wireless power receiving mode. means configured to provide wireless power transmission in a wireless power transmission mode, wherein the means comprises an H bridge circuitry arrangement (203, 210, 211) configured such that, in use during the wireless power transmission mode, the H bridge circuitry arrangement (203, 210, 211) self-oscillates; wherein the H bridge circuitry arrangement (203, 210, 211) comprises a resonance circuit comprising an inductor arranged in parallel with a capacitor; wherein the H bridge circuitry arrangement (203, 210, 211) comprises: a first circuit branch, a second circuit branch, and a bridged section, between the first and second branches, which comprises the resonance circuit; a first circuit branch, a second circuit branch, and a bridged section, between the first and second branches, which comprises the resonance circuit; wherein the second circuit branch comprises first and second transistors (Q1, Q2) whose gates are coupled to one side of the resonance circuit that is connected to a node between third and forth transistors (Q3, Q4) of the first circuit branch, and wherein the first circuit branch comprises the third and fourth transistors (Q3, Q4) whose gates are coupled to another side of the resonance circuit that is connected to a node between the first and second transistors (Q1, Q2) of the second circuit branch; the apparatus further comprising means configured to provide wireless power reception in a wireless power receiving mode, wherein such means comprises the H bridge circuitry arrangement (203, 210, 211), and wherein the H bridge circuitry arrangement (203, 210, 211) is configured to rectify an induced alternating voltage; the apparatus further comprising a voltage source, first means and second means, wherein the first means is configured to selectively couple the voltage source to the H bridge circuitry arrangement so that, when the H bridge is coupled to the voltage source, the self-oscillation of the H bridge circuitry arrangement is started for operating in the wireless power transmission mode; and wherein the voltage source is additionally coupled to the H bridge circuit arrangement via the second means configured so as to prevent the flow of current therethrough from the voltage source to the H bridge, whilst enabling the flow of current from the H bridge to the voltage source so as to enable charging up of the voltage source during operation in the wireless power receiving mode.