Plug-in Carbon Monoxide Detector – 3-in-1 CO Level Alarm with Temperature & Humidity Sensor, Easy Install Safety Device

A carbon monoxide reading you can actually see

Most carbon monoxide alarms tell you one of two things: nothing, or everything at once. They sit silent for years, then scream. This one plugs into a wall outlet and shows you a live number instead — the carbon monoxide level in the room in parts per million, alongside the temperature and the humidity, on a screen you can read from across the hall.

Shown in Black. Also available in White.

What the screen shows you

The display is the whole point of this device. Carbon monoxide is invisible and has no smell, so without a number on a wall you have no idea whether your kitchen sits at zero all day or drifts up every time the range is on. This gives you that number continuously, without you having to do anything.

Underneath the carbon monoxide reading, a second line carries room temperature and relative humidity. It is genuinely useful in the places people put these — a nursery, a spare room over a garage, an RV, a rented apartment where the heating is somebody else's decision.

It hangs flat off a standard outlet and covers only the socket it is using.

There is nothing to install

No drilling, no wiring, no bracket, no batteries to remember. The plug is built into the back of the case, so you push it into a wall outlet and it powers up and starts reading. If you move house, or move it from the hallway to the bedroom, you unplug it and plug it in somewhere else.

That also means it stops working in a power outage, which is worth knowing. There is no backup battery in this unit.

The plug is part of the case. The slots down the side are the sensor vents — leave them clear.

Where to put it

Carbon monoxide mixes fairly evenly through room air, so height matters less than placement. Put it in the rooms where a fuel-burning appliance lives or where people sleep — and keep it away from anything that will confuse it.

• Good: a hallway outside bedrooms, a landing, a room with a gas range, a garage-adjacent room, an RV.
• Not good: directly above a stovetop, inside a bathroom, in front of a window or an air vent, or behind furniture and curtains that block the side slots.
• Give it a few feet of clearance from any fuel-burning appliance, or you will read its normal start-up output rather than a problem.

A kitchen outlet a sensible distance from the range, rather than directly over it.

Being straight with you about what this is

Carbon monoxide poisoning kills people, so this section matters more than the sales copy above it.

The safety marks molded into the back of this case are not a certification. A genuine UL listing carries a file or control number and the word "Listed"; the mark on this unit does not. We could not verify any independent testing of this device, and we are not willing to describe alarm response times, accuracy or sensor lifespan that we cannot stand behind.

Three physical buttons: peak-reading history, self-test, and display mode and brightness.

Specifications

The White colorway. Same unit, same display.

Carbon monoxide detection is a life-safety function. This product is sold as a monitoring aid and is not a substitute for a UL 2034 listed carbon monoxide alarm, for correctly serviced fuel-burning appliances, or for professional advice. Test any carbon monoxide alarm regularly, keep the sensor slots clear, and never ignore an alarm. If you suspect carbon monoxide, leave the building and call your local emergency number from outside.