Tested Most Reliable by Lawrence Berkeley National Laboratory (LBNL).*
(click to download summary paper of these results);
LBNL Report LBNL-40556 (click to download entire report)*
Quantum Group Inc. manufactures all its carbon monoxide sensors in San Diego, CA.
BIOLOGIX Residential Carbon Monoxide Alarm Model B2011
Regular price: $55.00
The COSTAR® CO alarm comes with a test button that can be pressed. After pressing the test button the alarm will beep four times and then repeat that sequence one more time.