Kidde is recalling some of its smoke detector models because they don't detect smoke. The affected models are dual-sensor alarms and have a "pill shape" across the front. Check the back of it to see if it's model PI2010 or PI9010. If it is, look inside (you shouldn't need to take the smoke detector apart) to see if there's a yellow cap. If there is, you need to get a replacement from Kidde. Both the US Consumer Product Safety Commission and Kidde have more details and instructions on their sites. The aforementioned yellow cap covers one of two smoke sensors; about 452,000 units in the US and 40,000 in Canada were sold between September 2016 and January 2018. CLICK HERE for more details.