Review on UL Listed Photoelectric Smoke Alarm with Battery (Included), Battery Operated Fire Safety for Home - 1 Pack by Joseph Whiteman

I bought three and one of them is broken. The batteries are standard alkaline, so I replaced them with a new set of obviously good but still bad detectors. One would expect the supplier to test the safety device, but this is not the case. In addition, the batteries are not the type of long life batteries required by some governments. I do not agree to purchase in August and install after the 30 day return period. I tested the first one and got one of the good ones, not the bad one. Bad luck.