In some embodiments, as shown in FIG. 10B, a first magnet 1060 and a second magnet 1070 may be used to couple the power transmitter device 310 and the power receiver device 315. The first magnet 1060 is provided in the flat base portion 1010 of the power transmitter device 310 below the opening 1030. The first magnet 1060 is provided, for example, in the center of the transmitter coil 340 to avoid interference with the magnetic field generated by the transmitter coil 340. The second magnet 1070 is provided in the raised portion 1050 of the power receiver device 315. The second magnet 1070 is similarly provided, for example, in the center of the receiver coil 370 to avoid interference with the magnetic field generated by the transmitter coil 340. One advantage of providing the first magnet 1060 and the second magnet 1070 prevents accidental de-coupling of the power transmitter device 310 and the power receiver device 315, but still prevents any damage to the components when the power transmitter device 310 and the power receiver device 315 are de-coupled due to inadvertent pulling of the devices.