US Patent 11974685 Smart device for retaining planar items

An apparatus comprising: a retaining device for retaining planar items including mail and/or documents, in which mail can be located and from which mail can be collected; a control means; a sensor means for indicating to the control means information indicative of mail and/or documents having been placed in the retaining device and/or removed from the retaining device, wherein the control means is arranged to cause, in response thereto, at least one action to be performed.