My smoke detectors have been chirping for a while. I checked the 9v battery with the multimeter to see if they died. Nope, still good I checked the detector’s sticker on the back and saw it was made in 2003. They’re 20 years old now and I guess no longer good. So, I ordered a new pack of hardwired interconnect detectors.
I ordered a fire detector, CO2 sensor combo. Then I realized I couldn’t reach it with my ladder. I stored the sensor for six months until I got a taller ladder. When I finally got another ladder, I pulled the sensor out and discovered that somehow the plug that you splice to the wires is missing. I tore the closet apart looking for it, but it’s gone. So, I wasted $50. I can’t find a replacement plug anywhere.