Accessing interior compartments for storage or other purposes is improved by the use of one or more active material components. The showerhead plate includes gas holes in fluid communication with a plenum below the dielectric window, the plenum having a gas volume of no greater than 500 cm3. The processor is configured to store the first and second location information acquired in a communication area of the captured base station during a preset period of time in the storage unit in association with the identification information of the captured base station. A display displays the amounts received and authenticated.