A charging device (106, 200, 300) comprising: a first charging coil (108, 208, 308) 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 (110, 210, 310, 500, 600, 710, 810) 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 (110, 210, 310, 500, 600, 710, 810) including a first spiral (216a, 316a, 516a, 616a, 716a, 816a) and a second spiral (216b, 316b, 516b, 616b, 716b, 816b) that are defined in a common plane; and a controller (212, 312) configured to determine whether a chargeable wireless device is of the first type or the second type, the controller (212, 312) configured to cause the first charging coil (108, 208, 308) to wirelessly transfer power to the chargeable wireless device in response to the chargeable wireless device being of the first type, the controller (212, 312) configured to cause the second charging coil (110, 210, 310, 500, 600, 710, 810) to wirelessly transfer power to the chargeable wireless device by simultaneously causing a first current to flow through the first spiral (216a, 316a, 516a, 616a, 716a, 816a) in a first radial direction (220a, 520a) and a second current to flow through the second spiral (216b, 316b, 516b, 616b, 716b, 816b) in a second radial direction (220b, 520b) that is opposite the first radial direction (220a, 520a) to focus flux (536, 636, 736, 836) 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 (108, 208, 308) 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 (110, 210, 310, 500, 600, 710, 810) 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 (110, 210, 310, 500, 600, 710, 810) including a first spiral (216a, 316a, 516a, 616a, 716a, 816a) and a second spiral (216b, 316b, 516b, 616b, 716b, 816b) that are defined in a common plane; and a controller (212, 312) configured to determine whether a chargeable wireless device is of the first type or the second type, the controller (212, 312) configured to cause the first charging coil (108, 208, 308) to wirelessly transfer power to the chargeable wireless device in response to the chargeable wireless device being of the first type, the controller (212, 312) configured to cause the second charging coil (110, 210, 310, 500, 600, 710, 810) to wirelessly transfer power to the chargeable wireless device by simultaneously causing a first current to flow through the first spiral (216a, 316a, 516a, 616a, 716a, 816a) in a first radial direction (220a, 520a) and a second current to flow through the second spiral (216b, 316b, 516b, 616b, 716b, 816b) in a second radial direction (220b, 520b) that is opposite the first radial direction (220a, 520a) to focus flux (536, 636, 736, 836) 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.