A reference network node in a circuit-switched network obtains information about a partner network node by including a requesting element in a connection SETUP message sent to the partner network node. The step includes providing a first original bit stream including a video code which is a digitized video signal. The instant genetically modified human NSCs stably express ChAT in the brain tissue of AD animal and thereby restore the acetylcholine level, and learning and memory function comparable to normal animal. The elastic cover is configured to deform and expose the memory card upon depression, so that the memory card is ejected out of the housing via the slot.