7 Reasons We Stopped Trusting The Green Light On The Hallway Alarm.
You did the right thing the first time. You put a CO alarm in the hall and replaced the batteries when it chirped. You glanced at the green light on your way to bed. But that light only proves the unit has power — not that the sensor inside still reads air. Most of them stop reading the air years before they ever stop beeping.
Reason 01
1. The Green Light Lied To Mom For Years.
The little green LED on the side of the hallway alarm only tells you the unit has power. It does not tell you that the sensor inside still reads air.
Sensors lose sensitivity slowly. A six-year-old detector can look identical to a new one — same chirp, same green light — and miss the leak that matters.
Reason 02
2. A Reading You Can See — Not A Light To Trust.
Alveo shows live CO in PPM, gas as a percentage of the lower explosive limit, plus temperature and humidity. You stop hoping the alarm still works because the readings change in real time — you can watch them.
Reading thresholds designed to UL 2034 specifications.
Reason 03
3. The 70-PPM Rule You Were Never Told.
UL 2034 lets a standard CO detector stay silent at 70 PPM for as long as four hours. Alveo meets that same specification but shows you exposure on the screen long before the legal alarm threshold ever trips.
Reason 04
4. Catches Gas And Propane — Not Just CO.
Cracked heat exchangers leak more than carbon monoxide. They leak natural gas and propane hours earlier. Alveo monitors all three plus humidity — the precursor signs a single-sensor alarm cannot see.
Same plug. Same hallway outlet. Three more reasons the family wakes up the next morning.
Reason 05
5. The Numbers Most Detectors Cannot See.
Accidental carbon monoxide deaths in the U.S. hit 624 in 2022 — the highest count since 1999, up 86 percent since 2012. Most of those homes had an alarm on the wall that was only ever testing its own speaker.
U.S. CDC, National Vital Statistics, 2022.
Reason 06
6. An Amber Light When The Sensor Quietly Dies.
Most detectors have one light. Alveo has three — POWER, ALARM, and FAULT. The amber FAULT LED comes on when the sensor reaches the end of its life.
Reason 07
7. Send One To Mom’s House. Sleep Better.
The 4-pack is labelled “+ 1 for Mom’s house” because most of our buyers are daughters. One Alveo for your hallway. One for the parent who still insists her old alarm is fine because it still beeps.
Most of them never call to thank us — they call back to ask if they can send a second one to the sister in Florida.
Alveo 4 In 1 CO Detector
ForeWatch™ 4-in-1 stack · CO, natural gas, propane · live PPM readout · FAULT LED end-of-life signal.
x1
For a small apartment or one floor
x2
Covers the main living areas
x3
Recommended for full home protection
x4
Complete coverage including every bedroom
WHAT THE DATA SHOWS
Three Numbers Most Detectors Were Built To Miss.
624
Accidental CO deaths in the U.S. in 2022 alone.
CDC NVSS, 2022.
+86%
Rise in accidental CO deaths since 2012.
CDC, 2024.
102k
Emergency-room visits tied to CO each year.
CDC, 2023.
Stop Trusting The Green Light. Read The Air.
The old alarm was built to barely pass regulation. Alveo was built to read the air, show you the numbers, and tell you the moment the sensor can no longer be trusted.
Protect The Family Now →
Alveo 4 In 1 CO Detector