The green light says she’s safe. It only means it’s on.
Tether shows you the real-time number — from 0 — so you can know what’s in her air instead of hoping. It was built to watch the air, not wait for a disaster. And she’s alone in that house tonight.
- See the actual number, from 0 — not a light that only means “powered on.”
- Plug in, 30 seconds — no ladder, no tools, no electrician. Nothing for her to set up.
- CO + natural gas + propane in one — the sources a single CO alarm can’t see at all.
The hardest part about having aging parents is knowing you can't be there all the time. My mom lives alone in the house I grew up in. She still does everything herself, but after hearing stories about carbon monoxide poisoning, I realized how many dangers are completely invisible until it's too late. I ordered a Tether detector for her home and installed it that weekend. A few days later, I walked past it and saw the display reading '0.' For the first time in a long while, I felt myself relax. Not because I stopped worrying about my mom— but because I knew I was finally doing something to protect her.She gets to stay independent. I get to sleep a little easier. That's worth everything.
— Christine W., Daughter of Independent Seniors
The Green Light Has Been Glowing The Whole Time.
That was never the same as safe.
400+ Americans die from CO poisoning every year — most while sleeping.
100,000+ are rushed to the ER every year from accidental CO poisoning.
Roughly half of incidents fall in heating season, as furnaces run and windows stay shut.
You can’t see it or smell it. It gives no warning of its own — that’s the danger.
Carbon monoxide is the #1 cause of accidental poisoning death in America. (CDC, Jan 2026.)
Almost none of the victims had a broken detector. They had a working one. Green light on. Silent. On the wall the whole time.
For the person you’re buying this for, the gap sits even closer — and it hides three ways: she’s slower than she was and a standard alarm assumes she’ll hear it and run; she tests it faithfully and a worn-out sensor passes that test every time; the early symptoms look exactly like getting older.
“I’ll sort it next week” isn’t waiting a week. It’s one more night, and the night after that.
Every Breath Counts.
Cheap detectors wait. Tether doesn’t.
The “up to four hours” is a real maximum, not a defect — a deliberate design so the alarm doesn’t shriek at a seared steak. It’s the right tool for a sudden spike. It was just never built to watch the air for a parent who lives alone.
Introducing: Tether
Tether is a professional-grade plug-in detector built to show you the real-time level of carbon monoxide, natural gas, and propane — starting at 0 PPM. Not a light. The actual number.
It alerts the moment a level reaches 10 — early, while it’s still just an open window and a phone call. It plugs into any outlet in 30 seconds — no ladder, no tools, no electrician. You set it up on a visit; she does nothing.
It doesn’t replace the alarm on her wall. It goes right next to it. You’re adding the one thing the wall was missing: the number.
Because a green light can only tell you it’s on. Tether tells you what she’s breathing.
The People Who Measure Air For A Living Don’t Trust A Light.
They read a number.
Firefighters walk into a call with a meter that shows a live number on a screen — not a light. Gas technicians servicing furnaces all winter carry one. A light tells you a device has power; only a number tells you about the air.
- CDC recommends a digital-readout detector — one that shows the highest CO level in the home, not just an alarm.
- The elderly are named higher-risk by the CDC — and people asleep can be harmed before they ever feel symptoms.
- CO + natural gas + propane — the blind spots a single-gas alarm can’t see.
Like putting what the pros rely on in her hallway — beside the alarm she already has.
(CDC, Carbon Monoxide Poisoning Basics, Jan 2026.)
Meet The Families Who Can Finally See The Number.
Real homes, real readings — the proof a green light could never give.
Protecting Her Without Hovering
"My mom is 78 and still insists on doing everything herself. I respect that, but I also worry. After hearing about carbon monoxide leaks in older homes, I bought Tether for her house. It took less than a minute to set up. Now every time I visit, I glance at the display and see '0.' That little number gives me more peace of mind than I can explain."
The Best Gift I've Bought My Dad
"My father lives alone in the home I grew up in. The furnace is older, and honestly, I realized I had no idea how old his detector was. I replaced it with Tether last winter. He likes how simple it is, and I like knowing there's an extra layer of protection in the house. It's one of those purchases you hope never matters—but if it ever does, it matters a lot."
I Finally Stopped Worrying at Night
"Every winter I'd find myself wondering if my parents' house was really as safe as they thought it was. They're both in their seventies and don't think much about things like carbon monoxide. I bought them a pair of Tether detectors for Christmas. The first time I saw them plugged in and reading zero, I felt a weight lift off my shoulders. Worth every penny."
They Protected Me. Now I Protect Them.
"Growing up, my parents worried about everything to keep me safe. Now the roles have reversed. After reading about how dangerous carbon monoxide can be, I ordered Tether for their home. My mom joked that I was worrying too much, but she loves how easy it is to use. Knowing they're protected when I'm not there gives me a level of comfort I didn't realize I needed."
What Makes Tether So Different
| Tether | Cheap Detectors | |
|---|---|---|
| Shows real-time CO levels | ✓Digital display from 0 PPM | ✕Just a green light |
| Alerts you early | ✓Instant alert at 10 PPM | ✕Waits until 70 PPM |
| Detects natural gas + propane | ✓3-in-1 protection | ✕CO only |
| Easy install | ✓Plug-in, 30 seconds | ✕Ceiling mount, ladder |
| No false-alarm panic | ✓Shows a number, not a scream | ✕Goes off at toast |
| Test checks the sensor | ✓The number is the test | ✕Only tests the speaker |
| Replaces your alarm? | ✓No — adds to it. Keep yours. | ✕— |
Every row is the same point from a different side: a light makes you believe; a number lets you know.
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Tether
Tether
• See the actual number — from 0 PPM. Not a green light that only means "powered on." A real-time CO reading you (and she) can actually read.
• Warns early — at 10, not 70. Alerts while levels are still rising, so there's time to open a window and make a call - before a standard alarm would even start.
• CO + natural gas + propane, plug-in in 30 seconds. Three threats in one unit, into any outlet — no ladder, no tools. Adds to the alarm she already has; never replaces it.
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Tether
Get it between - and -.
She already has a detector. Why does she need this?
She already has a detector. Why does she need this?
Keep it — this adds to it. A standard alarm catches a big, sudden spike, and it does that job. What it doesn't do is show the level in real time, warn early, or tell you the sensor's still alive. Tether adds all three, right beside the alarm she already has. It's the number the light could never give you.
Is it hard to install? She won't want me fussing.
Is it hard to install? She won't want me fussing.
Thirty seconds. It plugs into any outlet — no ladder, no tools, no electrician, nothing permanent. You can set it up on a visit and she does nothing. If she ever moves, it moves with her.
Your Purchase Is Protected By Our
90-Day “Sleep In Peace” Guarantee
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. So add it beside the alarm she already has and see how you sleep. If you don’t feel calmer, safer, and finally certain about the air in that house, you have 90 days to send it back for a full refund. We carry the risk, not you.
Real, Verified Results: See Why Families Stopped Trusting The Green Light And Started READING The Number
Every review below is from a real, verified Tether customer.
Tether Detector
I Could Finally Stop Worrying About My Mom
"My mother is 79 and lives alone in the house I've known my entire life. Every winter I'd find myself wondering if everything was okay over there. I bought Tether for her birthday and installed it myself. It sounds simple, but knowing she has that extra layer of protection has helped me sleep better than I have in years."
Tether Detector
The First Thing I Bought After The Furnace Repair
"Our furnace needed repairs last fall and it got me thinking about how much we take home safety for granted. I ordered Tether for our house and another for my parents. The peace of mind is hard to put a price on. It's one of those things you hope you never need, but you'll be grateful it's there if you do."
Tether Detector
"I Didn't Want To Depend On My Kids"
"My son bought me a Tether detector after insisting my old one was overdue for replacement. At first I rolled my eyes. Now I'm glad he did. It's easy to use, easy to read, and gives both of us confidence that my home is safe. I still live independently, and that's important to me."
Questions From Families
She already has a detector. Why does she need this?
She does — keep it. A standard alarm catches a big, sudden spike, and it does that. What it doesn’t do is show the level in real time, warn early, or tell you the sensor’s still alive. Tether adds those, beside the alarm she has. Not a replacement — the number the light could never give you.
She tests it faithfully every month. Isn’t that enough?
Her diligence is real and worth keeping. But the monthly test only confirms the horn and circuit — that it can still make noise. It doesn’t check the sensor, the part that detects gas. A worn-out sensor passes that test every time, green light glowing. A live number is a test that runs every second.
Could her tiredness and headaches just be age — or the air?
We can’t tell you, and neither can a green light, and neither can the symptoms — low-level CO looks exactly like getting older, which is how it hides. The point isn’t the odds. It’s that you can’t rule it out by feel — only by a number. (Tether measures the air. It does not diagnose any medical condition — if a loved one has symptoms, see a doctor.)
Will it false-alarm every time she cooks?
No. It’s not an on/off scream. It shows the number, so when cooking nudges it up a little, you see exactly that: a small number that settles back to zero.
Does it detect propane and natural gas, or just CO?
All three — carbon monoxide, natural gas, and propane, in one unit. A standard CO alarm detects none of the latter two.
Is it hard to install? She won’t want me fussing.
Thirty seconds. Plug it into any outlet — no ladder, no tools, no electrician. There’s nothing for her to set up.
Can she use it if she lives alone / rents?
Yes. It’s a plug-in — nothing permanent. Works the same in an apartment, and moves with her if she ever does.
Her alarm’s hardwired — isn’t that already better?
Hardwired just means steady power. It says nothing about whether it shows the level, warns early, or picks up gas. Tether sits alongside it and adds the part that was missing. Power was never what you were short on. The number was.
What if it doesn’t work for us?
90-day money-back guarantee. Add it, see how you sleep, send it back if you don’t feel safer.
How fast will I receive it?
Free shipping on multi-packs, dispatched promptly. [Confirm exact delivery window before launch.]
You Can’t Be There Every Night. The Number Can.
In one version of the nights ahead, a number tells you early — while it’s still just an open window and a phone call. In the other, a green light keeps glowing until it’s too late. Same house. Same mother. The only difference is whether anyone could see the number.
Keep her old alarm. Add the number beside it — before you see her next.
Protect Both Homes »Tether displays a real-time reading on its screen; it is not a phone-connected or remote-monitoring device, and it does not diagnose any medical condition. It is an addition to — never a replacement for — your existing UL-listed CO alarm. Keep the alarm she has.