Review on X-Sense SC01 10 Year Battery (Wireless) Smoke and Carbon Monoxide Detector with Display, Dual Sensor Smoke CO Alarm Meets UL 217 & UL 2034 Standards, Auto-Check, 3-Pack by Yoganand Stradley

First of all, I feel absolutely confident in having these two sensors and carbon monoxide sensors installed. They comply with the latest UL standards published in 2016, UL 268: Smoke Detectors for Fire Alarm Systems, Seventh Edition, and UL 217: Smoke Detector Standard, Eighth Edition. less annoying alarms. I took off one star for the installation. The faceplate doesn't match the blue control box I had from previous smoke alarms. As a result, I drilled two holes in the ceiling. Another thing that worked for me is that they are bigger so the fs you are calling is colored with different colors that should hide it.