A pressure sensor chip is provided with first and second retaining members. The charging apparatus of the mobile vehicle includes a charging apparatus and the rechargeable battery. The book is designed so that the animal will sustain interest in the book and interact with the reader. In addition, the feature access information may be accessible to the server system, such that the server system may periodically update the feature access information, such as, for example, when the user accesses the server system to download multimedia content. The method includes energizing at least one actuator of a tendon drive system to thereby apply the augmenting tensile force.