Designed as a retrofit solution for interconnected AC-powered smoke detector systems, only one 2GIG Smoke Detector Sensor is required to monitor the entire house and connect to the 2GIG alarm panel.

X-Sense Mini wireless interconnected smoke detector review: This tiny alarm networks with up to 24 others It’s not a “smart” smoke alarm, per se, but it does offer solid protection on a budget.

Using motion detectors and an Ardunio you can add a little extra wow to your Halloween displays this year. This article covers the circuits and the code to make that happen.

Plenty of other "combo" units exist, but most include only a single smoke detection technology—either a photoelectric or ionization sensor—along with a CO detector.