A sunshade assembly includes a winding shaft, a sunshade cloth wound around the winding shaft, and a pull rod connected to one end of the sunshade cloth. A product or item describing a service are scanned to obtain both a product or service code and an advertisement promotion code provided by a vendorretailer or manufacturer of the product or service using a smartphone of a first user. Such countermeasures can include balancing circuitry inside a cryptographic hardware device to reduce the amount of variation in power consumption that is correlated to data parameters being manipulated. The positions of the scattering fibers across the cross-section of the optical element may be selected so as to form a two-dimensional photonic crystal structure for light transversely incident on the optical element. Two keys are used to avoid re-encrypting the encrypted data for each member of the telespace. The first emitting layer and the second emitting layer both include a hole transporting material.