Milk frother appliance

An appliance that is dockable onto a drinks preparation machine, for preparing frothed milk and, for this purpose, includes at least one connection for steam produced by the drinks preparation machine, as well as an interface for electrical current delivered from the drinks preparation machine. The appliance also includes a milk frothing unit with a gear pump. The gear pump at an inlet side is connected to a milk feed conduit and to an air feed. A mixing nozzle is provided on a path of milk delivered by the gear pump, to which mixing nozzle this milk, the steam as well as the air can be fed.