In a home security context, there are two ways to look at "wired" vs. "wireless." The first is power -- home security systems require electricity to operate. In that context, a wired system would be one with devices that plug into power and rely on your home's electricity. A fair number of current-gen systems use wireless, battery-powered sensors and battery backups for the base stations that will keep the setup running if the power ever goes out. You can think of those systems as "wireless" as far as electricity is concerned. There's a second way to look at wired vs. wireless. It concerns connectivity. Every home security system needs to be able to notify you when there's a problem and alert the authorities when there's an emergency. It used to be that systems would notify you with the sound of the alarm and contact authorities via a wired connection to your phone line. Now, most current-gen systems can also notify users of issues with a push alert on their phones. Some will use an internet connection to contact professionals during an emergency. Even then, we'd still consider the system "wired" if you can stop it from operating by cutting your home's internet signal. That's why many systems include built-in cellular connectivity as a backup. Even if the Wi-Fi goes out (or if a tech-savvy intruder disables it), a system like that will still be able to notify you and the authorities of an emergency by way of that cellular connection. Systems like those are "wireless" in the connectivity sense -- and if they double down with a battery backup as well, then they're as wireless as home security gets.