A transmitter for wirelessly charging a device, wherein the transmitter is capable of receiving messages from the device, the transmitter comprising: - a transmitter coil; - a transmitter capacitor; and - transmitter electronics that comprise: - a configurable driver for inductive transfer of power for charging the device; - a DC current sensor for measuring a DC current; - a DC voltage sensor for measuring a DC voltage; - an AC current sensor for measuring an AC current; and - a controller configured to control the driver and continuously monitor the measured DC current, the measured AC current, and the measured DC voltage of the transmitter while charging, wherein said controller is configured to adjust a level of power provided by the transmitter by reconfiguring the driver with driver parameters selected from a group consisting of operating frequency, duty cycle, amplitude, and any combination thereof, based on the measured DC current, the measured AC current, or the measured DC voltage indicating a power level deviation or receipt of a message, from the device, indicating a reset of another power level; wherein said transmitter is configured to inductively transfer power to a relay (200, 300) that is configured to inductively transfer power to the device, wherein the transmitter and the relay (200, 300) are separated by a medium with no galvanic connection; and said controller is further configured to determine changes in joint resonance frequencies with respect to an allowed range of frequencies, wherein the joint resonance frequencies comprise two resonance frequencies formed by a combination of the transmitter and the relay. - a transmitter coil; - a transmitter capacitor; and - transmitter electronics that comprise: - a configurable driver for inductive transfer of power for charging the device; - a DC current sensor for measuring a DC current; - a DC voltage sensor for measuring a DC voltage; - an AC current sensor for measuring an AC current; and - a controller configured to control the driver and continuously monitor the measured DC current, the measured AC current, and the measured DC voltage of the transmitter while charging, wherein said controller is configured to adjust a level of power provided by the transmitter by reconfiguring the driver with driver parameters selected from a group consisting of operating frequency, duty cycle, amplitude, and any combination thereof, based on the measured DC current, the measured AC current, or the measured DC voltage indicating a power level deviation or receipt of a message, from the device, indicating a reset of another power level; - a configurable driver for inductive transfer of power for charging the device; - a DC current sensor for measuring a DC current; - a DC voltage sensor for measuring a DC voltage; - an AC current sensor for measuring an AC current; and - a controller configured to control the driver and continuously monitor the measured DC current, the measured AC current, and the measured DC voltage of the transmitter while charging, wherein said controller is configured to adjust a level of power provided by the transmitter by reconfiguring the driver with driver parameters selected from a group consisting of operating frequency, duty cycle, amplitude, and any combination thereof, based on the measured DC current, the measured AC current, or the measured DC voltage indicating a power level deviation or receipt of a message, from the device, indicating a reset of another power level; said transmitter is configured to inductively transfer power to a relay (200, 300) that is configured to inductively transfer power to the device, wherein the transmitter and the relay (200, 300) are separated by a medium with no galvanic connection; and said controller is further configured to determine changes in joint resonance frequencies with respect to an allowed range of frequencies, wherein the joint resonance frequencies comprise two resonance frequencies formed by a combination of the transmitter and the relay.