A controller, the controller comprising an input/output for receiving and transmitting data when the controller is communicatively coupled with an inductive sensing circuit and a portable handheld device, the portable handheld device having electromagnetic emitting functions, and the controller operable to implement a switching function for switching between two modes: a first mode in which the controller is configured to communicate with the portable handheld device to cause deactivation of at least a portion of electromagnetic emissions of the device, and to concurrently communicate with the inductive sensing circuit to cause activation of the inductive sensing circuit; and a second mode in which the controller is configured to communicate with the portable handheld device to cause activation of said at least portion of electromagnetic emissions of the device, and to concurrently cause deactivation of the inductive sensing circuit, characterized in that, in the first mode, the controller is configured to cause the portable handheld device to activate a power supply from the portable handheld device to the inductive sensing circuit or alternatively to cause the inductive sensing circuit to activate a signal generator in the inductive sensing circuit to trigger supply of a drive signal to an antenna in the inductive sensing circuit, and wherein, in the second mode, the controller is configured to cause the portable handheld device to deactivate said power supply from the portable handheld device to the inductive sensing circuit. the controller comprising an input/output for receiving and transmitting data when the controller is communicatively coupled with an inductive sensing circuit and a portable handheld device, the portable handheld device having electromagnetic emitting functions, and the controller operable to implement a switching function for switching between two modes: a first mode in which the controller is configured to communicate with the portable handheld device to cause deactivation of at least a portion of electromagnetic emissions of the device, and to concurrently communicate with the inductive sensing circuit to cause activation of the inductive sensing circuit; and a second mode in which the controller is configured to communicate with the portable handheld device to cause activation of said at least portion of electromagnetic emissions of the device, and to concurrently cause deactivation of the inductive sensing circuit, characterized in that, in the first mode, the controller is configured to cause the portable handheld device to activate a power supply from the portable handheld device to the inductive sensing circuit or alternatively to cause the inductive sensing circuit to activate a signal generator in the inductive sensing circuit to trigger supply of a drive signal to an antenna in the inductive sensing circuit, and wherein, in the second mode, the controller is configured to cause the portable handheld device to deactivate said power supply from the portable handheld device to the inductive sensing circuit. a first mode in which the controller is configured to communicate with the portable handheld device to cause deactivation of at least a portion of electromagnetic emissions of the device, and to concurrently communicate with the inductive sensing circuit to cause activation of the inductive sensing circuit; and a second mode in which the controller is configured to communicate with the portable handheld device to cause activation of said at least portion of electromagnetic emissions of the device, and to concurrently cause deactivation of the inductive sensing circuit, characterized in that, in the first mode, the controller is configured to cause the portable handheld device to activate a power supply from the portable handheld device to the inductive sensing circuit or alternatively to cause the inductive sensing circuit to activate a signal generator in the inductive sensing circuit to trigger supply of a drive signal to an antenna in the inductive sensing circuit, and wherein, in the second mode, the controller is configured to cause the portable handheld device to deactivate said power supply from the portable handheld device to the inductive sensing circuit.