Universal Security Instruments Battery, Smoke, Fire, and Carbon Monoxide, Alarm, with Voice Alerts

I WAS IN NEED OF PURCHASING A REPLACEMENT SMOKE/CARBON MONOXIDE ALARM. THERE WERE MANY TO CHOOSE FROM, MOST OF WHICH WERE QUITE EXPENSIVE. I SETTLED ON THIS UNIT BECAUSE IT WAS HALF THE PRICE OF THE OTHERS SHOWN. I RECEIVED IT VERY QUICKLY. I HAD NO PROBLEM SETTING IT UP AND INSTALLING IT. I'M VERY HAPPY WITH THIS PRODUCT, SO MUCH SO THAT A COUPLE OF DAYS LATER I PURCHASED ANOTHER ONE TO REPLACE A SECOND ALARM THAT STOPPED WORKING. I ALSO LIKE THE FACT THAT THE WARNING ALARM SOUND IS CLEAR AND AUDIBLE AND THAT THE UNITS WILL LAST FOR 10 YEARS.

It appears to be working fine and it speaks in two languages which is a first for me. I got a good deal too.

I just bought this but wow it seems like a fantastic price for a combo smoke detector. Overall very pleased with my purchase.

Great smoke and Co detector and you won't find a better price anywhere. It also comes with 10 year energizer batteries.

Great product plus it's a combo fire and carbon monoxide sensor.

Great product for the price

Gave it to my kids who didn't have one. Get it's for 3 different things

Super easy to install and great price

I purchased three to replace old “end of life” popular brand. I have had them foe 2 weeks and One has already failed. Going back to other

I purchased this battery-powered detector (model USI/SMCO/REP) at the end of July 2026 to replace a battery detector in the same location. It is now late October 2026, and the detector just triggered false fire alarms twice in the middle of the same night at 3:30 AM and 4:40 AM. When I attempted to silence the alarm via the button, it gave a voice prompt stating "too much smoke to be silenced," even though the area was completely clear. I had to keep pressing the silence button and pull the batteries to stop it. The installation location is in an unused, virtually dust-free hallway, and there were no signs of bugs or debris. I believe the photoelectric chamber or internal processing unit on this standalone battery detector was defective. I specifically chose USI over competitors like Kidde or First Alert because USI detectors are UL-rated and generally have better feedback regarding false positives. I also own six of USI's hard-wired units (USI/SMCO/HWREP), which have been working fine so far, though those are also only 3 months old. I will be replacing this unit with a hard-wired USI/SMCO/HWREP for now, as the detector location does have wiring accessible. If you also have wiring accessible, you may want to skip this battery-powered model, as battery voltage drops or temperature fluctuations during a colder fall night could make these battery-only units less reliable (just my guess).