A power delivery system for wirelessly delivering power to a target device, the power delivery system comprising: a power source operable to source alternating current power; a communication module (110, 212) configured to receive, via magnetic coupling and/or via RF communications, a request for power delivery and a wireless communication from the target device, the wireless communication including target device authentication information; a sending resonant coupling component operable to couple the alternating current power to a coil (1010, 1102) for wireless power transmission; characterized in that the power delivery system further comprises: a target device authenticator (109, 209, 503, 607, 707) coupled to the communication module (110, 212), the target device authenticator (109, 209, 503, 607, 707) configured to select, based on the target device authentication information, a target resonant frequency to be used for transfer of wireless power to the target device; wherein the sending resonant coupling component is coupled to the power source and to the target device authenticator (109, 209, 503, 607, 707), the sending resonant coupling component is configured to receive information from the target device authenticator (109, 209, 503, 607, 707) regarding the target resonant frequency; and a power transmitting unit capable of dynamically tuning wireless power transmission to the target resonant frequency, wherein the target resonant frequency is specified dynamically. a power source operable to source alternating current power; a communication module (110, 212) configured to receive, via magnetic coupling and/or via RF communications, a request for power delivery and a wireless communication from the target device, the wireless communication including target device authentication information; a sending resonant coupling component operable to couple the alternating current power to a coil (1010, 1102) for wireless power transmission; characterized in that the power delivery system further comprises: a target device authenticator (109, 209, 503, 607, 707) coupled to the communication module (110, 212), the target device authenticator (109, 209, 503, 607, 707) configured to select, based on the target device authentication information, a target resonant frequency to be used for transfer of wireless power to the target device; wherein the sending resonant coupling component is coupled to the power source and to the target device authenticator (109, 209, 503, 607, 707), the sending resonant coupling component is configured to receive information from the target device authenticator (109, 209, 503, 607, 707) regarding the target resonant frequency; and a power transmitting unit capable of dynamically tuning wireless power transmission to the target resonant frequency, wherein the target resonant frequency is specified dynamically. a target device authenticator (109, 209, 503, 607, 707) coupled to the communication module (110, 212), the target device authenticator (109, 209, 503, 607, 707) configured to select, based on the target device authentication information, a target resonant frequency to be used for transfer of wireless power to the target device; wherein the sending resonant coupling component is coupled to the power source and to the target device authenticator (109, 209, 503, 607, 707), the sending resonant coupling component is configured to receive information from the target device authenticator (109, 209, 503, 607, 707) regarding the target resonant frequency; and a power transmitting unit capable of dynamically tuning wireless power transmission to the target resonant frequency, wherein the target resonant frequency is specified dynamically.