A container is formed of a shell having a top section, a bottom section and a central section connecting the top section and the bottom section. The method includes selecting a target memory unit of the memory system having a timing margin in response to a trigger to start a timing margin measurement. In prior art, the opening, with the bearing and the struts, is often produced as a single-piece together with the reservoir and the base by injection molding. The second lens encapsulates one of the LED chips and a lighting pattern provided from the LED chip encapsulated by the second lens is converted into a second lighting pattern.