5 reviews for Independent CO Alarm Sensor Carbon Monoxide Alarm Detector High Sensitive Warning LCD Display CO Alarm With UL2034

+3
AliExpress Shopper
Rated 5 out of 5
February 6, 2026
As described. Aesthetic carbon monoxide sensor. Powered by two rechargeable batteries or AA batteries (large batteries). There are instructions included. The package contains fixing pins. The suspended sensor indicates proper operation by blinking the LED every 30 seconds, and when it detects carbon monoxide, it activates a visual and audible alarm. The alarm is quite loud.

+1
AliExpress Shopper
Rated 5 out of 5
February 5, 2026
Instructions included. Wall mounting bracket is not very secure (but holds). Requires 2 x AA batteries (not included). When in operation, the LEDs flash. Excellent and powerful alarm siren.

+2
A***v
Rated 5 out of 5
February 4, 2026
Delivery by ukrposhta, packed in a branded cardboard box with instructions. Two aa batteries are required for power. I tested it near the boiler, a minute later, when smoke came out, the sensor worked and started beeping quite loudly. I think it will be quite audible at night in case of an alarm.

+2
A***v
Rated 5 out of 5
February 4, 2026
Delivery by ukrposhta, packed in a branded cardboard box with instructions. Two aa batteries are required for power. I tested it near the boiler, a minute later, when smoke came out, the sensor worked and started beeping quite loudly. I think it will be quite audible at night in case of an alarm.

s***r
Rated 5 out of 5
January 7, 2026
It uses two AA batteries, I used the test function and the beep it emits and the LED screen that shows the CO concentration work perfectly. I hope the alarm never activates 😬!