Bests & Worsts Reviews from Amazon

I purchased a four-pack of these alarms. Two of them were defective, a 50% failure rate. The TEST/MUTE button did not work on the two failed units. The test button is actually a flexible flap on the plastic cover. Attached to the underside of the flap is a plastic post about 3/4" long which is supposed to contact a push button switch on the product's printed circuit board when the test button is pressed. But on the failed units, the post missed the switch completely. Product would probably still work as a smoke alarm, but the fact that you can't test it or mute it constitutes a safety defect in my opinion. I have submitted a report to the Consumer Product Safety Commission.