Heat generation is an important concern of electrochemical cell design. When the plug and play device is connected to a host, the access control device is first connected to the host to execute an authorization procedure. The series of attached sheets are comprising envelope sheets and rectangular content pages. A forward portion of the center frame rail section can be positioned below a rear section of the forward frame rail section to form a forward overlapping section. The rear-projection-type display apparatus includes a reflective optical-element group having at least two reflecting mirrors provided between the projection lens and the screen to deflect a light from the projection lens.