"Cordless" means something does not require or have a cord or wire to function. It can operate wirelessly or without being connected to an electrical outlet or other devices. Full definition
Conveniences include safes and separate sitting areas, as well as cordless phones with free local calls and voice mail. (hongkong-travelguide.com)
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It's a new take on an old problem that exists with cordless phones and audio baby monitors, which often allowed people to inadvertently, or intentionally, listen in on other people's conversations, he said. (abcnews.go.com)