The invention relates to a method of and a device for monitoring the operation of a flotation cell. A plurality of electrodes is formed by a first electrically conductive layer deposited on a substrate and by a plurality of second electrically conductive layers. A plurality of section text groups may be formed based on the set of documents, where each section text group may be associated with a respective section from the plurality of sections and each section group includes a plurality of items. Each of the inputs of the remote control device is associated with a unique one of a plurality of audible signals. Alternatively, the size of the opening may be fixed and can be covered with a tab that attaches to the enclosure with hook and loop fasteners, snaps and similar means.