Excellent

17,127+ 5 Star Reviews

Necknix HomeGuard™ 4-in-1 Safety Monitor

4-in-1 Protection Against: Carbon Monoxide, Natural Gas, Propane, and Smoke Due to Fire

Early Alert System: Danger warning before it's too late

Live Digital Display:  See what's actually in your air

Plugs in Anywhere:  5 seconds, no tools

Battery Backup:  Protected even when power goes out

Self-testing:  Always monitoring, always working

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Never thought about CO until a friend had a scare. Plugged this in, saw the zero on the screen and felt better instantly. It just sits there and does its job.

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— Sandra K., Verified Customer

Carbon Monoxide Is the #1 Cause of Accidental Poisoning Deaths in America.

Every Year, 400+ Americans Go To Sleep And Never Wake Up

Don't Let Your Family Become A Statistic

Most families assume they're protected. They're not.

CO has no smell. No color. No taste. It silently fills your home while you sleep. Your furnace kicks on in the middle of the night. A small leak. Nothing dramatic. No explosion. No fire. Just gas, slowly building in the air your family is breathing.

 

But you're asleep. You feel nothing. By morning, your family doesn't wake up.

100,000+

ER visits/year due to CO exposure

400+

Accidental Deaths per year due to CO exposure

100,000+

of fatal CO incidents occur from September to April.

No Warning

Many detectors can stay silent during long exposure to low or mid-level carbon monoxide, even though those levels can still cause serious health problems or death.
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Trusted By 151,637+ American Families

Every Second Counts: Protect Your Family From Deadly Gas Leaks and Fires

Real-Time Monitoring for Carbon Monoxide, Propane, Natural Gas, and Smoke.

Real-Time Readings, 24/7

Do you know what quality of air your family is breathing right now? Most detectors stay silent until CO hits 70 Parts Per Million (PPM). By then you've been breathing it for hours.

 

The Necknix HomeGuard monitors from 0 PPM and shows you live CO and gas levels every second of every day. Not a green light. Not a guess. A real number, in real time, so you always know your family is safe.

"I look at that screen every morning before I make coffee. 

Seeing '0' every day has completely changed how I feel in my own home."

— Michelle R., Ohio

4 in 1 Protection

Most detectors only watch for one danger. Necknix HomeGuard gives your home 4-in-1 protection by monitoring carbon monoxide, natural gas, propane, and smoke from fire in one device. With clear real-time readings and instant alerts, you can spot danger early and act fast.

“I bought Necknix HomeGuard for CO protection, but it ended up alerting us to a kitchen fire. A pan started smoking while we were in the other room, and the alarm went off before we noticed. We got there fast and stopped it before it got serious.”
— Chris K., Minnesota

Instant Alert

When danger hits, seconds matter. The Necknix HomeGuard sounds an immediate alarm alerting your family that CO, gas or smoke has been detected, cutting through sleep and noise No confusion. Just fast, clear action when it counts most.

"My daughter is 7. She heard the alarm during our test and knew exactly what to do. That alone was worth every penny."
— David T., Georgia

5 Second Setup

No ladder. No tools. No electrician. Plug the Necknix HomeGuard devices into any standard outlet and your family is fully protected.

"My daughter is 7. She heard the alarm during our test and knew exactly what to do. That alone was worth every penny."
— David T., Georgia

Battery Backup Protection

Power outages don't pause gas leaks or fires. The Necknix HomeGuard keeps monitoring your home even when the lights go out, because the moments you're most vulnerable are exactly when you need it most.

"We lost power during a storm last winter. First thing my husband said was 'at least the Necknix HomeGuard is still running.' That's when I knew we made the right call." — Sandra M., Michigan

Always On, Always Working

Most detectors fail silently. The green light stays on long after the sensor dies and you'd never know. The Necknix HomeGuard continuously runs self-checks so you never have to wonder if it's working. It always is.

"I thought we were safe because our detector never went off, but an annual HVAC inspection found a dangerous leak our 'working' alarm completely missed. Now I realize I had no idea if it even worked. Never making that mistake again."— James L., Texas

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Join the Families That Trust Necknix HomeGuard

Built to Professional Standard

The Necknix HomeGuard  Safe uses certified electrochemical sensor technology found in professional-grade detection equipment across the US. It monitors continuously, self-tests automatically, and runs on backup power even when the power goes out.

 

This isn't a light that blinks green and hopes for the best. It's a real-time detection system built for the one job that matters: keeping your family breathing safe air.

Get Complete Home Protection With 

Necknix HomeGuard 

Early 24/7  CO Detection

Most detectors wait until CO hits 70 PPM. 

By then you've been breathing it for hours. 

Necknix HomeGuard monitors from 0 PPM so 

you see danger rising in real time.

4-1 Protection

Monitors carbon monoxide, natural gas, and 

propane and smoke due to fire. One device, 

zero gaps.

 

Instant Alarm Alert

Sounds immediately when CO or gas, or

smoke is detected so your family knows to 

get out fast.

 

5-Second Setup

Plug into any standard outlet. No tools, 

no wiring, no hassle.

 

 

Battery Backup

Keeps monitoring even when the power goes 

out.

 

 

Always Self-Testing

Runs automatic safety checks around 

the clock so you never have to wonder if it's 

working.

 

5-Year Rated Lifespan

Built to protect your home for years, not 

months.

 

 

What Makes Necknix HomeGuard Different

NECKNIX HomeGuard

Standard Detector

Shows real-time CO levels

Detects CO, natural gas,
propane and smoke

Early Alert System

Easy install

Battery backup

Self-testing

Service life

5-Years

Up to 2 years, if you're lucky

Guarantee

90 days

Buy with Confidence - It’s 100% Risk-Free!

Try the Necknix HomeGuard in your home for 90 days. If you don’t feel safer knowing exactly what your family is breathing, we’ll refund every penny. No questions asked.

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98.4% WOULD RECOMMEND THIS PRODUCT

Hear What Others Have to Say About
The Necknix HomeGuard

Easy Setup

4.9
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Detection Accuracy

4.9
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Alarm Response

4.9
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Value for Money

4.9
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4.8

Based on reviews from
17,127+ customers

Rated Excellent Based on 17,127+ reviews

Don't Miss Out On This Limited-Time Offer. 
Order Now

Complete Protection From Carbon Monoxide, Natural Gas, and Propane. All in One Device.

Fast 2-3 shipping from our US Warehouse

90 Day Back Guarantee

5 Years of Protection

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Had no idea my old detector could just stop working with the light still on. Picked this up after reading about it. Plugged it in, screen showed zero, done. Runs itself from there. 

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— Mike D., Verified Customer

Frequently Asked Questions

What does the Necknix HomeGuard actually detect

It detects carbon monoxide, natural gas, and propane. Most cheap detectors only cover CO. This one covers all three.

How do I install it?

Plug it into any standard wall outlet. That's it. No tools, no ladder, no electrician. Takes 5 seconds.

What does the number on the screen mean?

It shows you the live CO level in your home at all times. Zero means your air is clean. The higher the number the more CO is present. If levels get dangerous the alarm goes off automatically.

How is this different from my current detector?

Most standard detectors just show a green light and don't alarm until CO hits 70 PPM. By then you've already been breathing it for hours. The Necknix HomeGuard Safe shows you real numbers starting at 0 PPM so you see danger rising before it becomes an emergency.

What happens if the power goes out?

The built-in battery backup keeps it running even when the power goes out.

How do I know it's actually working?

It runs automatic self-checks continuously. You don't have to do anything. If something is wrong it will tell you.

How long does it last?

The Necknix HomeGuard Safe is rated for 5 years. Most cheap detectors burn out in 2 to 3 years while the green light keeps glowing like nothing is wrong.

Where should I put it?

Near gas appliances like your furnace, water heater or stove, and in the hallway outside bedrooms. Most homes are fully covered with 2 to 4 units.

How many do I need?

One per floor is a good starting point. Add one near any gas appliance and one outside each sleeping area for full coverage. Most families need 2 to 4.

How long does shipping typically take?

The product will be dispatched within 48 business hours. Standard delivery usually takes between 2-3 days. Once your order is shipped, you will receive a tracking link via email. Thank you for choosing our product!