This object holds the serial number of the current device and is accessible only for notification purposes, included as identifying evidence in all five of this MIB's notifications (card insertion/removal, PIN invalid/changed, and access media changed). An admin uses it in received traps to identify which physical device chassis generated the event, separate from the wireless card's own serial number. For example, a hh3cWirelessCardInserted trap would carry hh3cDevSerialNumber to identify the host router alongside hh3cWirelessCardSerialNumber for the card itself.