cmlltid code means radio transmitting equipment type approval code. Radio transmitting equipment is defined as all kinds of equipment that emits radio waves, but does not include industrial, scientific research, medical equipment, electrified transportation systems, high-voltage power lines and other electrical devices that can radiate electromagnetic waves.
A router is a hardware device that connects two or more networks, acting as a gateway between networks, and is a network device that reads the address in each packet and then decides how to transmit it with specialized intelligence. It is able to understand different protocols, such as the Ethernet protocol used by a particular LAN and the TCP/IP protocol used by the Internet.