Google Nest Protect: 2nd Gen Smoke + CO Alarm - Wired

Nest Protect smoke and carbon monoxide alarm redefines the standards. New sensors, new algorithms changed what smoke alarms can do. With added smarts and safety features, the second generation Nest protect goes above and beyond. Nest Protect ring glows yellow if there is a problem, red in an emergency, green to show you the batteries and sensors are working. It uses two wavelengths of light to spot different types of smoke enabling it to catch all kinds of fires in the most efficient way. There is a newly integrated smoke chamber designed to reduce false alarms. Designed with a stainless steel screen and hexagonal holes too small for anything but smoke to get inside.