A charging device comprising: a first charging coil configured to wirelessly transfer power to a first type of wireless device using near-field inductive coupling via a first magnetic field that oscillates at a first frequency; characterised by a second charging coil configured to wirelessly transfer power to a second type of wireless device using near-field inductive coupling via a second magnetic field that oscillates at a second frequency that is greater than the first frequency, the second charging coil including a first spiral and a second spiral that are defined in a common plane ; and a controller configured to determine whether a chargeable wireless device is of the first type or the second type, the controller configured to cause the first charging coil to wirelessly transfer power to the chargeable wireless device in response to the chargeable wireless device being of the first type, the controller configured to cause the second charging coil to wirelessly transfer power to the chargeable wireless device by simultaneously causing a first current to flow through the first spiral in a first radial direction and a second current to flow through the second spiral in a second radial direction that is opposite the first radial direction to focus flux that is generated by the first current and the second current in a shape of a toroid having first and second cross-sections that intersect the respective first and second spirals (216a-216b, 316a-316b, 516a-516b, 616a-616b, 716a-716b, 816a-816b) at the common plane in response to the chargeable wireless device being of the second type. a first charging coil configured to wirelessly transfer power to a first type of wireless device using near-field inductive coupling via a first magnetic field that oscillates at a first frequency; characterised by a second charging coil configured to wirelessly transfer power to a second type of wireless device using near-field inductive coupling via a second magnetic field that oscillates at a second frequency that is greater than the first frequency, the second charging coil including a first spiral and a second spiral that are defined in a common plane ; and a controller configured to determine whether a chargeable wireless device is of the first type or the second type, the controller configured to cause the first charging coil to wirelessly transfer power to the chargeable wireless device in response to the chargeable wireless device being of the first type, the controller configured to cause the second charging coil to wirelessly transfer power to the chargeable wireless device by simultaneously causing a first current to flow through the first spiral in a first radial direction and a second current to flow through the second spiral in a second radial direction that is opposite the first radial direction to focus flux that is generated by the first current and the second current in a shape of a toroid having first and second cross-sections that intersect the respective first and second spirals (216a-216b, 316a-316b, 516a-516b, 616a-616b, 716a-716b, 816a-816b) at the common plane in response to the chargeable wireless device being of the second type. <EOS>