5 of 5 people found the following review helpful
This review is from: Fireangel CO-9D Digital Sealed for Life Carbon Monoxide Alarm (DIY & Tools)
Item deliver quickly and as expected. Seems to be doing a good job, but how do you tell with these things. Instructions for using clear also tells you where to position for effective use. Decided on this one as you can check back over 30 days.