Stopped the chirping sound.

Replaced my old detector that was chirping. The wiring is very simple and took about 5 minutes to install. It took me longer to grab my tools than it did to complete the installation. No more chirping. I give 4 stars because the detector date was already 2 years old. It leads me to think that I'll get two less years out of it. I'm not sure if it works that way but it doesn't make me feel 100% confident in the expiration period.

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