8000 Series button expansion modules are used to achieve the required amount of call buttons for audio or audio / video systems. Each module has a terminal connection that houses 2 terminals for each button. One side of each button is pre-linked making a common terminal and may be removed to provide a volt-free button for the likes of a trade facility. Nameplate windows are illuminated by LED. Modules are available as 2-buttons (8842) up to 5-buttons (8845). Double buttons modules are also available where 2 buttons share the same name plate window (8842D 4-button up to a 8845D 10-button). The standard front plate is stainless steel (/S), modules are also available in matt aluminium (/A).