The invention generally describes a method an apparatus for removing dry or dead skin from an area to be exfoliated. The device comprises a controller device, user interface, injector portion, and a storage device such that a user of the device may initialize multiple dispensing functions in the injector portion and user interface via a user input. A frictional member is disposed to come in frictional contact with the joint member as the duct cap moves between open and closed position. The magnetic member overlaps an end of a developing region in a direction of a rotational axis of the developer carrier, when viewed from a direction perpendicular to the rotational axis. After that, the pluggable electrical unit is identified and, in accordance with the identity of the pluggable electrical unit, the full connection or full isolation between the base unit and the pluggable electrical unit is established.