A fuel cell system determines whether an operation condition of a fuel cell corresponds to a fuel gas shortage or an oxidation gas shortage. In one aspect, PRL entries are stored in two tables. When the device detects an occurrence of the particular audio alert triggering event, the device emits the audio alert related to the triggering event. The protein isolates have a protein content of at least about 90 wt %. The multilayered polymer film may be used to form, for example, a reflective polarizer or a mirror. This gusset provides additional fire blocking to provide a pillow-top mattress with improved performance when tested according to Technical Bulletin 603 of the State of California.