The Linksys CIT400 is a cordless phone system that also acts as a wireless router. It features DECT 1.9 GHz technology for clear and secure calls, a 2.2-inch color display, and a built-in speakerphone. The router portion allows for wireless connectivity with speeds of up to 54 Mbps and has WEP, WPA, and WPA2 security protocols. It also includes a built-in answering machine with up to 20 minutes of recording time. The CIT400 supports up to four handsets and can be expanded up to a total of six.

The CIT400 is a router manufactured by the company Linksys that allows multiple devices to connect to a network and communicate with each other. It works by receiving data packets from devices and forwarding them to their intended destination. The router is assigned a unique IP address , which serves as its identifier on the network.

To access the router's settings and configure its functions, users can log in using a web browser and their and . Once logged in, users can customize various settings such as network name, password, and security protocols. They can also set up parental controls, prioritize bandwidth usage, and monitor network activity.