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Upgrade 4-in-1 Plug-in Combination Gas & Carbon Monoxide Detector
Upgraded Sensor Design
4-in-1 Design Sensor:Electrochemical Sensor,Catalytic Combustion Sensor,Fahrenheit Sensor and Humidity Sensor
matt penland
2025-09-05 16:57:08
Work great and have had no issues with them
Kathleen
2025-07-28 16:56:29
I’ve had the detectors for a couple of weeks now and I am very satisfied. Not only do they detect the gas levels, but they also clearly show the humidity level and the indoor temperature. All you have to do is plug it into an outlet. Great find!
Customer
2025-07-05 18:37:29
This unit is very responsive!I sprayed the countertop with Lysol and it was quick to alarm very clearly and loudly.
EDALOS
2025-06-29 15:42:16
A whole lot of people don't, but everybody SHOULD have a CO detector in their home.There are definitely cheaper ones out there. Battery powered ones, and ones with less features. But this three pack is a really good value.You get not only CO and natural gas detection, you get a thermometer and a basic humidity reader as well. The outer shell of the thing lights up very brightly, and it has voice alerts.Also, don't panic when you first plug it in. It takes a bit to calibrate itself and warm up. It will first display a VERY high PPM (mine was in the 400 range) on CO, but it's a false reading, and will go down to normal very quickly.Here's my 2 big complaints: First, there's no battery backup on this device. Any and all safety devices such as this, smoke detectors, fire alarms, etc. should come with a battery backup option.Second, nowhere in any documentation I could find does it tell you at what level of either CO or natural gas does the alarm go off. Different ppm levels of CO are dangerous for different time frames. 10 ppm indoors can be dangerous after 8 hours continuous exposure. 30 ppm indoors can be dangerous after an hour. 100 ppm indoors can start showing symptoms in minutes. So, what level do these things alarm on? I have no idea.But, for basic functionality, these are great. I just wish I knew in advance how fast I should hurry out of the house if one of these goes off.
SKK
2025-06-12 19:39:29
Works as advertised, no issues yet
FlyingV
2025-05-21 10:48:08
Before I ordered these I checked online to learn more about the manufacturer, Hembisen. It appears they have a history of making detectors for home and commercial uses so that was reassuring.The instructions advise the device will need time to calibrate after you plug it in - glad I read that first. There is a plastic film that you peel off the display then once you plug it in the alarm sounds with red alert lights. This is normal so don't FREAK OUT. ; )The alerts turned off shortly but the temp reading was waaaay off. After about an hour it settled in at the proper temp.My only minor issue is the lack of a battery backup. The CO detector in my basement is a plugin with a battery and that does give you a bit more piece of mind. I'm not sure if that is work taking off one star on the rating. I doubt it will ever be an issue and since I already have a battery backup detector near the furnace, I will go with 5 stars.Otherwise I'm happy with these - nice to have natural gas and CO detector that also has humidity and temp readings.
John P
2025-04-20 17:08:03
This set of carbon monoxide detectors provides a nice option for a layer of protection and security both in the home and potentially when traveling. As long as there is an available outlet, it is very convenient to just “plug and play“, as it requires no batteries or set up. Also nice is the fact that it displays temperature and humidity as well as carbon monoxide levels (expressed in PPM), as well of course, a high level carbon monoxide alarm. The display is large enough that I can see and read it from a distance, and also contains multiple color indicators, making its measurements easy to understand at a glance. The relative small size of each unit (it can fit in the palm of my hand), as well as its light weight, lends itself to travel scenarios, especially in situations where accommodations will include more than one room. I validated Its measurements against other devices to validate its relative accuracy.
JR
2024-12-23 12:52:45
These units works as intended. Tells me humidity level, temperature and of course carbon monoxide levels. These units don't have a battery backup, if power goes out these units will go offline until electricity comes back on. The sounds on these units aren't as loud as well. Overall these are great for the price.
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