Cordless and corded telephones are devices used for voice communication over a phone line. Cordless phones use radio signals to communicate with a base station, while corded phones are directly connected to the phone line via a cord.  Cordless telephones allow for mobility and can be used without being tied down by a cord. They usually come with a charging station that doubles as a base station for the phone. Corded telephones, on the other hand, have a fixed location and can only be used within the range of the cord.  Corded telephones and conference telephones require a wired connection to a phone line or network, while cordless telephones and two-way radios are wireless and use radio signals to communicate. Each type of telephone has its own benefits and limitations, and the choice between corded or cordless depends on individual needs and preferences.

Conference telephones are designed to facilitate group conversations between multiple people in different locations. They are equipped with multiple microphones and speakers to capture and reproduce the sound from all participants in the conversation. Conference telephones can be either corded or cordless, depending on the model.

Two-way radios, also known as walkie-talkies, are portable communication devices that use radio waves to transmit and receive messages. They allow for two-way communication between two or more users in close proximity. Two-way radios are often used in outdoor activities such as hiking, camping, and hunting, as well as in industrial settings such as construction sites and warehouses.