Businesses listed under other electronic equipment supply, install, maintain or repair electronic products that do not fit more specific categories. Their stock may include audio and visual equipment, electronic components, control systems, security devices, communications equipment, test instruments and specialist equipment for commercial or industrial use. The range varies according to whether a business serves households, tradespeople, organisations or technical industries. Customers may be able to buy individual items, components, accessories and replacement parts, or obtain advice on selecting equipment for a particular purpose. Some businesses offer installation, configuration, fault diagnosis, servicing and repairs, while others focus on wholesale supply or equipment hire. Work can include connecting devices, checking compatibility, replacing components and testing that equipment operates correctly.