A test element, analytical system and method for optical analysis of fluid samples is provided. The airbag cushion is provided therein with a tether having a rectangular shape corresponding to a sectional shape of the airbag cushion. The coins fall to the bottom and stack up inside the tube. On the other hand, if it is judged that the inputted biological information meets the first criteria but does not meet the second criteria, a category of message data different from the category determined by the first determining means is determined, and a message belonging to the determined category is outputted. With the present invention, the style of the protective device enclosing the mobile device can be altered by merely replacing its backboard with a new one.