🔍 BW Technologies BWC4-B-N Clip4 - 4-Gas Detector with Lexan, TPE & Plastic Construction in Black - 2-Year Durability - Compact Design Review

This household sensor is a great addition to any home! It's easy to set up and provides peace of mind knowing that your home is protected from combustible gas leaks. The visual and audible alarms make it clear when danger is present. The compact size of the sensor is a pro, but it may not blend seamlessly into all décor styles. Overall, a highly recommended investment in Tools and Home Improvement for your family's safety.

I had to calibrate it immediately as the devices had an activation date that was overdue but other than that they work fine

This is a gas detector - 4 in 1 - so there are four other sensors that could be defective - In my case one sensor was defective when I turned on the detector. So now I have a 3 in 1 detector. :-(