The Kidde Ring measures 1.8 by 5 by 5 inches (HWD) and weighs 1.3 pounds. It’s a hardwired device that contains black (hot) and white (neutral) wires, as well as a red wire used to interconnect ...

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We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Kathryn Rath Kathryn Rath is a writer covering audio, video, and smart-home ...

Abstract: In this paper, a low profile and high sensitivity metamaterial microwave sensor for dielectric materials characterization is presented. The proposed sensor consists of one split ring ...