Method and system are disclosed for automated testing of a patient’s hearing. Accordingly, a waterproof effect and durability of the shelf assembly are improved. In some situations, the additional information is provided by temporarily modifying the information being presented by the presentation program, such as to provide additional information that is related to functionality corresponding to a subject area of the currently presented information andor corresponding to an aspect of the currently presented information that is indicated by the user. The value of the signature event counter is adjusted to not include a count of signature events past a sliding window. The first belt roller and the first resist roller are coaxially arranged, and the first belt roller rotates independent of the first resist roller. Each frame consists of the addressing of all n rows.