Component-based applications are defined as an assembly of components requiring services from and providing services to each other. The current component models provide a description of the functional requirements of an application. However, they do not take into account the requirements of components for properties separately from the functional ones. In this article, we propose a component model that expresses explicitly the required properties, in addition to the functional requirements, to describe the underlying environment (i.e., hardware and network entities) in a uniform way. The components can monitor these properties in order to be aware of their changes. If a property is not monitorable, we propose a procedure that allows the transformation of the components to make it monitorable