First Alert Onelink Smart Smoke and Carbon Monoxide Detector, 2-pack ($199.99) $119.99

@Costco.

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Emergency Alerts Sent to your Phone

Interconnects with other Onelink Devices, When One Sounds, They All Sound

Compatible with iOS and Android, works with Alexa and Apple Homekit

Hardwired Version Includes Universal Adaptors for Quick and Easy Installations with Existing First Alert®, BRK®, Kidde®, and Firex® Alarms

Voice Alarm Tells Where Potential Danger Exists