An antireflection film includes alternately deposited high-refractive-index layers and low-refractive-index layers. The hand held computer includes a microprocessor, a keyboard and a data input system for entering data into the microprocessor, a display screen and a data output circuit for displaying data from the microprocessor, and a data storage circuit for storing data converted to the microprocessor, and a plurality of control keys for operating in a plurality of modes. The two or more multilayer piezoelectric elements are arranged in a row, and the two or more columns are arranged between the multilayer piezoelectric elements. When the seat becomes occupied, or whenever there is a large change in the measured seat weight, the seat and floor weight are recorded, the occupant weight is estimated according to the recorded seat weight, and the inflatable restraints are allowed or suppressed based on the estimated occupant weight. The method has a step of selecting one of the at least two levels of protection of the occupant protection means as the level of protection to be used in the event of an impact of the vehicle using a yaw direction of the vehicle. The device is particularly well suited for use by persons who expect to have inadequate access to bathroom facilities, such as people pursuing recreational activities or attending large public gatherings, as well as persons who have a greater than normal need for access to a bathroom, such as people with diabetes.