The intercom system range has been designed for use in clean rooms, food processing areas, hospitals, airports, manufacturing workshops, prisons and various other environments where the need for announcements and general mass communication exists. The industrial product range consists of a Loudspeaker Master Station, with single or dual channel operation. Features include individual call buttons, auxiliary input with level control, a switch for channel selection and input/output lines, which are fitted with channel selection switches. Additionally, flashing ‘Push to talk’ and ‘Call’ LED indicator switches are built in to ensure a simple operation process. All outstations have a waterproof rating of IP 65, which allows them to be water washed, preferably hosed down, where necessary, without jeopardising their functionality.