Appliance to which one of a plurality of magnetic attachments is attachable

An appliance 102 comprising a main unit 104 to which one of a plurality of magnetic attachments 114 is attachable in a plurality of rotational positions relative to the main unit about an axis A; a magnetometer 220; and a control module 315. The control module is operable to determine which of the plurality of attachments is attached to the main unit based on data output by the magnetometer. The appliance comprises one or more of the following features: (i) the magnetometer is located on the axis; (ii) each magnetic attachment comprises a plurality of magnetic regions distributed about the axis in a rotationally symmetric arrangement, and the magnetometer is located radially inwardly of the plurality of magnetic regions when the attachment is attached to the main unit; and/or (iii) each magnetic attachment comprises a magnetic region located on the axis when the attachment is attached to the main unit. The appliance may be a hair appliance. In response to the input from the magnetometer, the control unit may control a speed of the electric motor, or a temperature of the heater; or flow rate and temperature of the airflow. The magnetometer may be a Hall effect sensor.