SENTINEL 8 PACK

Name: SENTINEL 8 PACK
Brand: NORTHSTEAD
Price: 359.00 USD
Availability: OutOfStock

$359.00 $789.00 $44.88 each

Sentinel is an easy-to-use smoke, CO & gas detector that monitors danger in real time—so you can protect your home and the people you love before it’s too late.

Protect Your Family Before Danger Strikes

Sentinel is your always-on home safety detector, designed to detect smoke, carbon monoxide, and dangerous gas threats before they become a disaster.

With real-time monitoring and instant alerts, Sentinel gives you the warning you need to act fast — helping protect your home and everyone you love, 24/7.

Detect Danger Early — Get alerted to potential threats before they turn into life-threatening emergencies.

Simple to Set Up. Easy to Trust. — Designed for effortless everyday protection, without complicated installation or confusing controls.

24/7 Protection for Your Family — Day or night, Sentinel stays on guard, helping protect your children, parents, pets, and everyone under your roof.

PROTECT YOUR HOME TODAY — SAVE 50%

Limited-Time Offer — While Supplies Last

NOT AVAILABLE ON AMAZON OR EBAY

Don’t Wait for the Alarm. Know What’s in the Air.

Carbon monoxide is the #1 cause of accidental poisoning deaths in America.

Every year, hundreds of Americans die from unintentional carbon monoxide poisoning, while many more require emergency medical care.

CO can come from everyday sources around your home — furnaces, water heaters, gas stoves, fireplaces, generators, and attached garages.

You can’t see it.

You can’t smell it.

But Sentinel helps you detect it.

Unlike basic alarms that may only alert you after CO reaches a set threshold, Northstead Sentinel continuously monitors your space and provides a real-time PPM display, helping you stay informed about changing CO levels.

Every Breath Counts.

Don’t Just Wait for a Warning. See What’s in the Air.

Introducing: The Northstead Sentinel CO & Gas Detector

Sentinel is an advanced CO & gas detector designed to help you stay informed with real-time readings for carbon monoxide, natural gas, and propane.

With its clear digital display, Sentinel lets you see what's happening in your environment — so you're not left waiting for an alarm to know when something may be wrong.

Simple to use and easy to install, Sentinel plugs directly into a standard outlet in seconds — no tools, no wiring, no electrician required.

Adding Sentinel to your home is a simple step toward greater awareness and peace of mind for you and the people who matter most.

Because invisible dangers can go unnoticed. Sentinel helps you see what you can't smell.

Designed By Firefighters. Built To Save Lives.

SENTINEL was developed with first responders who saw the same tragedy repeat itself — families with "working" detectors who never got the warning they deserved.

✓ UL 2034 Certified — Strictest CO detector standards in North America

✓ Professional-Grade Sensors — Same technology used by fire departments

✓ ETL Listed — Independently tested for safety and accuracy

SENTINEL isn't just another detector. It's the detector firefighters wish every home had.

Like having a fire station in your hallway — watching the air so you don't have to.

Meet the American Familys who protect themselfes with Northstead Sentinel

Bobby M.

Verified Buyer

"I Saw 47 PPM. My Old Detector? Silent."

"We had a 'working' detector for 6 years. Green light. Beeped when I tested it. Then I got Sentinel just to double-check. First night: 47 PPM in my son's bedroom. My old detector? Still glowing green. Still silent. I unplugged it and threw it in the trash. Sentinel probably saved my son's life."

Jan M.

Verified Buyer

“Grandmas House is Safe Again!”

"When my daughter drops the grandbabies off for the weekend, I can honestly say to myself, 'They are completely safe here.' I am the matriarch — it's my job to provide a safe sentinel. Sentinel gave me back that peace of mind. Grandma's house is officially the safest place on earth again."

Karolina T.

Verified Buyer

"I Sent One to My Parents"

"I bought one for our house and sent two to my parents. Mom is 74 and lives alone. Her old detector was 12 years old — the sensor was dead but the green light was still on. Now I don't lie awake at 2 AM wondering if she's okay. Best decision I ever made."

What Makes SENTINEL So Different

Your Purchase Is Protected By Our

90-Day "Sleep In Peace" Guarantee

Here at SENTINEL, we make sure our customers feel safer — or we refund 100% of their investment. We're so confident you'll finally sleep knowing your family is protected that we'll bear all the risk.

90 Day Money Back Guarantee

Some families feel the relief the first night. Some take a week to stop checking the old detector out of habit. Everyone's different. So the best thing you can do is give it a try — and if you don't feel safer, calmer, and finally certain your family is protected, you have 90 days to claim a refund and get your money back.

Real, Verified Results:

See Why Families Are Replacing Their Detectors and Calling

SENTINEL "Life Saving"

Note: All reviews below are from actual paying customers. They have been authenticated and verified

Amanda K.

Verified Buyer

"My Husband Doesn't Argue About Safety Anymore"

"My husband said our old detectors were 'fine.' Then I showed him that 40% of detectors fail to alarm at dangerous levels. We ordered Sentinel that night. He doesn't argue about safety anymore."

Michaela T.

Verified Buyer

"I'm 74 and I Did It Myself"

"I am 74 years old and I secured my entire home in under an hour without climbing a dangerous ladder. I felt so capable and independent. I don't have to call my son to come check things for me — I have Sentinel telling me I'm perfectly fine."

Thomas D.

Verified Buyer

"One of the Most Important Things I Own"

"I'm going to be 75 years old and I've often thought, 'what would I do if something happened because I live alone?' Now I look at that little screen, see '0,' and I know. I'm not alone. Sentinel is watching."

Jon T.

Verified Buyer

"It Caught What Our $200 Nest Missed"

"We had a Nest Protect in every room. Top of the line, right? I bought Sentinel just to compare. First week: Sentinel showed 29 PPM. The Nest? Silent. Green light. We had a cracked flue pipe. Four kids in this house. I don't even want to think about what could have happened."

David L.

Verified Buyer

"I Bought Pack 4 — One for Each Family Member"

"I kept one for myself and gave one to each of my adult children for their homes. I can't think of a better gift to give my family — a gift that says 'I love you and I want you safe' without saying 'I'm worried about you.' I hope they never need it, but if they do, Sentinel will be there."

PROTECT YOUR HOME NOW!

90-Day Money Back Guarantee

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Secure Checkout

Questions from Homeowners

Most detectors only show a green light — which stays on even when the sensor is dead. They don't alarm until 70 PPM, which is AFTER 1-4 hours of exposure. SENTINEL shows you real-time levels from 0 PPM on a digital display. You see the truth, not a light that lies.

No. SENTINEL uses professional-grade electrochemical sensors — the same type used in industrial settings. They detect real threats, not toast or shower steam.

SENTINEL is a 4-in-1 detector. It monitors carbon monoxide, natural gas, AND propane, plus temperature and humidity. This is a critical distinction. Most cheap detectors from the hardware store only detect CO. If your stove leaks natural gas, your furnace has a propane leak, or your water heater line is compromised, those detectors stay completely silent. SENTINEL catches all three gas threats in real-time, with PPM readings on the display starting at 0. One unit. Complete protection. No gaps.

SENTINEL plugs into any standard wall outlet, no ladder, no tools, no electrician. 30 seconds and you're protected. For placement, focus on two priorities: near gas appliances (furnaces, stoves, water heaters) and in hallways outside bedrooms where your family sleeps. SENTINEL's sensors are calibrated to detect all three regardless of outlet height. Most families start with one near the furnace/water heater, one in the kitchen near the stove, and one in the hallway outside bedrooms. The 4-Pack covers most homes completely.

No. Plug it into any eye-level outlet. That's it. Takes 30 seconds. No ladder, no tools, no electrician.

One per floor + near bedrooms + near gas appliances (furnace, water heater, garage). Most homes need 4. Apartments typically need 2.

Yes! SENTINEL is perfect for people who live alone. It watches 24/7 and will alert you to danger even while you're sleeping. Many of our customers are seniors who live independently and wanted peace of mind.

You're covered by our 90-Day "Sleep in Peace" Guarantee. If you're not satisfied for any reason, we'll refund every penny. No questions. Plus, the Lifetime Guarantee means we replace it free if anything ever goes wrong.

Hardwired means it runs on electricity — but the SENSOR inside still expires after 5-7 years. The green light stays on even when the sensor is dead. SENTINEL plugs in and shows you a real number, so you always know it's working.

Ships from US warehouse. 5-7 days typically.

SENTINEL 8 PACK