Recommended by firefighters
Protect your family from the
silent killer
- Free shipping
- 100-night trial
- Lifetime warranty
- AS FEATURED IN -
Mira Detector™ warns you first
It doesn’t wait until the air is dangerous. You see the number rise from zero — and act before a late alarm becomes the first sign of trouble.
The part nobody tells you
Your alarm is built to stay silent until it’s almost too late.
Carbon monoxide harms the body long before a standard alarm reacts — and it can legally wait hours to sound. That’s why seeing the live number matters.
30 PPM
Headache, fatigue, nausea
50 PPM
Physical stress increases
70 PPM
Most alarms finally react
Meet Mira Detector™
The detector with a display.
Plug it in, see the live number, and know at a glance that you’re safe — or act fast if you’re not.
- See CO from 0 PPM — not a yes/no lightWatch the live number climb long before an old alarm would beep.
- Plugs in anywhere in 30 secondsAny standard outlet. No ladder, tools or electrician — one per floor.
- Won’t false-alarm when you cookReads carbon monoxide and gas — never smoke or steam.
- 4 sensors in one deviceCO, gas, humidity and temperature together. Most detectors catch only one.
- 100-night risk-free trialNot right for you? Full refund, return shipping covered — plus a lifetime warranty.
The silent killer
You can’t see it. You can’t smell it. And it doesn’t hurt.
CO leaks from furnaces, water heaters and stoves — and a dead sensor keeps glowing green anyway.
- 400+
- Deaths every year in the US
- 100k+
- ER visits a year — often mistaken for the flu
- 5–7yr
- Then the sensor dies — silently
A threat you’ll never sense
No color, no smell, no warning — and a standard alarm can stay silent until it’s already dangerous.
Real families. Real protection.
All reviews verified — from paying Mira Detector™ customers
Worth it just for week one
Bought this after my brother-in-law's family had a scare. Week 1, Tuesday morning, I see 23 PPM in the basement. My $40 First Alert upstairs? Quiet as always. Cracked heat exchanger on a 9-year-old furnace. Just get the 4-pack. Don't mess around with this stuff.
For my dad
My dad is 78 and lives alone in Pittsburgh. Bought him the 2-pack and drove over to plug them in myself. Now when I call him Sundays the first thing I ask is what's the number say dad and he reads it to me. 0 every time. Silly little ritual but it makes me feel better.
Caught a problem before it caught us
Reading 12 PPM in the laundry room three days after installing. Turned out the gas dryer vent had come loose behind the wall. No symptoms yet, no beeping alarm — just a number on a screen that told us something was wrong. Plumber said another week and we'd have been in the ER. Buy this.
Replaced all 3 of my old detectors
I had three Kidde plug-ins and didn't know if any of them actually worked. After reading about the 5–7 year sensor life thing I tossed all three and replaced with the 4-pack. Now I can glance at the screen every morning and know it's working. Worth every penny for the peace of mind.
For our new baby
We have a gas furnace and a baby on the way. My OB literally told us at our last appointment to upgrade our CO detectors. The 4-pack arrived in 2 days and my husband had them all plugged in before dinner. Knowing the number is 0 right outside the nursery lets me sleep.
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Choose Your Protection:
2-Pack
In stock · ships within 24-48 hours
What's included
✓ 2 Mira Detector™ detectors
✓ Free US shipping
✓ 100-night money-back trial
✓ Lifetime warranty
4-Pack
In stock · ships within 24-48 hours
What's included
✓ 4 Mira Detector™ detectors
✓ Free US shipping
✓ 100-night money-back trial
✓ Lifetime warranty
8-Pack
In stock · ships within 24-48 hours
What's included
✓ 8 Mira Detector™ detectors
✓ Free US shipping
✓ 100-night money-back trial
✓ Lifetime warranty
Your Purchase Is Protected By Our
100-Night “Sleep-Easy” Guarantee
At Sentry Goods, we make sure our customers feel safer — or we refund 100% of their purchase. We’re so confident you’ll finally sleep knowing your family is protected that we’ll bear all the risk.
Got Questions? We got you covered!
How is this different from the detector I already own?
Your current alarm stays silent until CO hits around 70 PPM — and even then it can legally wait up to 4 hours before sounding. It only ever says “fine” or “emergency,” nothing in between. Mira Detector™ shows the actual number on a display from 0 PPM, so you see a problem building while it’s still just a problem. And unlike a sealed green-light unit, you can always see it’s actually working.
Where do I put it? What height?
Plug it into a standard wall outlet at or slightly above eye level — outlet height is fine, because CO mixes evenly with air, and you want the display where you’ll actually glance at it. Put one near each sleeping area and one near your main fuel-burning appliance (furnace, water heater or gas stove), plus one per floor. Avoid placing it right next to the stove or in a bathroom. No ladder, no drilling.
How many do I need?
Simple rule: one per floor, plus one near every sleeping area and one near your main gas appliance. A typical 2-story home with a basement furnace needs about 4 — basement, main floor, and outside the bedrooms. Apartments often do fine with 2.
Will it false-alarm when I cook?
No. The sensor reads carbon monoxide and gas — not smoke or steam — so searing a steak or a steamy shower won’t set it off. And because you see the actual number rise and fall, you understand what’s happening instead of being startled by a random blare.
How do I know the sensor still works?
This is the whole reason Mira Detector™ has a screen. A standard detector’s test button only checks the speaker. With Mira Detector™, the live number is your proof of life: if it’s showing a real reading, the sensor is working, every day.
What if it doesn’t work for me?
Plug it in tonight and live with it for 100 nights. If you’re not completely happy for any reason, send it back — we refund every cent and cover return shipping. After the trial, every Mira Detector™ is covered by a lifetime warranty.
Can I use it in a rental or RV?
Yes — both. It just plugs into a standard outlet, so there’s no drilling, no hardwiring and no landlord approval needed. It’s also popular for RVs, campers and cabins, where CO from a generator or propane heater is a real risk.
How do I contact support?
Real humans, usually within the hour during business hours. Pick whatever’s easiest:
Email: Support@Sentry-Goods.com
Phone: +1 (888) 676-0008
From the community
Real questions. Real people.
2,458 comments · sorted by Top
Can someone vouch for this? Saw the ad three times today and my wife is pregnant so I’m not taking any chances with our gas furnace. Is it actually legit or just another drop-ship detector?
342 Likes
@Marcus works awesome man. Ordered the 4-pack after my brother-in-law had a scare with his water heater. One per floor + one in the hallway outside the bedrooms. Reads 0 PPM consistently. Get the 4-pack — you’ll want one near the nursery.
218 Likes
Seconding Dan. Had mine 2 months. Quiet, no false alarms, and the digital readout is the reason I bought it over the beeper ones. Congrats on the baby!!!
127 Likes
We have a gas stove and I’ve been paranoid ever since I read that study last year. My regular alarm has NEVER gone off but I don’t feel safe. Does this actually show the low levels you can’t smell?
128 Likes
Yep. Got one near our gas stove. Reads 2–6 PPM when the burners are going and drops back to 0 within 10 min of turning the hood on. Honestly kind of eye-opening. We run the hood every time now.
89 Likes
32 years retired from the fire service. Responded to more CO calls than I can count. The digital PPM readout is the right idea. Standard alarms only trigger above 70 PPM sustained. By then the damage is starting. Bought the 4-pack for my kids’ houses. Sleep better knowing it’s there.
381 Likes
HVAC tech here. Saw one of these in a customer’s basement last month, didn’t think much of it. Two days later it caught a back-drafting flue on a tankless water heater. Now I recommend them on every gas appliance job.
219 Likes
Anyone with the 8-pack got a placement diagram for a 2-story + basement? Where do you put #5 through 8
79 Likes
genuine question, is this just a CO detector with a screen? what’s the point of the screen if it still alarms at the same level
66 Likes
screen shows the live PPM. lets you see if something’s slowly building before it hits the alarm threshold. mine showed 8 ppm one morning, traced to a gas fireplace pilot. fixed it before anyone got sick. that’s the point
182 Likes
How is this not on Amazon? Kinda sus
51 Likes
Hey Daniel — we sell direct to keep prices honest and ensure every unit ships from the latest production batch. Amazon resellers often unload aged inventory and the CO sensor degrades on the shelf. We’re the only authorized seller.
194 Likes
2,458 Comments · 94% of commenters recommend Mira Detector™
Who it’s for
If you burn anything, this is for you.
Parents
Peace of mind in every room your kids sleep in.
Gas-heat homes
Furnace, water heater or stove? You have a CO source.
Aging parents
A number they can read to you over the phone.
Renters
Plugs in, no install, comes with you when you move.
RVs & cabins
Generator and propane risk, wherever you are.
Protect your family tonight
Know what’s in the air your family breathes.
See the number. Every day, in every room that matters.
✓ Free US shipping ✓ 100-night trial ✓ Lifetime warranty