Several Cloud prouducts have a facility port, which is intended to extend the capabilities of the unit by allowing the connection of a remotely located active module. The combination of products such as the Z8ii/Z4ii and the active module allow designers to provide simple, cost effective solutions to many customers requirements that are difficult to achieve with other manufacturers' units. For Back Box Fittings Please See: http://www.scolmore.com/_pdfs/essentials.pdfFor Weatherproof/Outdoor Fittings Please See: http://www.cef.co.uk/catalogue/categories/weatherproof-wiring-accessories-easy-seal