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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Then, there are countless other smart devices you can add to enhance your security system, including motion sensors, extra door/window sensors, internal cameras, external cameras, doorbell cameras, keypads, or Google Nest devices.
Source: https://www.slashgear.com/1174719/the-best-home-security-systems-on-the-market/