2025 Home Protection Award
YOUR DETECTOR STAYS SILENT. OURS DOESN'T.
Dual CO + Gas Detection. Real-Time Display.
80,000+ 5 Star Reviews
"Around 4,000 cases of CO poisoning are treated in A&E departments across England every year."
"Carbon monoxide is a silent killer — CO incidents in London have more than doubled in recent years."
"The worst CO detectors don't sound the alarm — and pose a danger to anyone who has one installed."
"Only 46% of English homes had a CO alarm in 2020, leaving millions of households vulnerable."
Plug In
Any standard outlet. No wiring, no batteries. Anyone can install it.
See Levels
Real-time CO and gas readings on the digital display.
Stay Safe
Get alerted early before symptoms start. Your health can't wait.
REAL-TIME PROTECTION
Know Before It's Too Late
Most detectors wait until 50 PPM to alarm. By then, you've been exposed for hours. Sentinel shows levels starting at 0 PPM — so you see danger rising, not after it's too late.
Sentinel vs. Cheap Detectors
|
Others | |
|---|---|---|
| Detects low-level CO (10 PPM) | ✓ | |
| Detects natural gas leaks | ✓ | |
| Detects temperature & humidity | ✗ | |
| Real-time PPM display | ✗ | |
| No false alarms | ✗ | |
| Lifetime replacement guarantee | ✗ |
"
Our old detector showed green for years. Sentinel showed 41 PPM in our utility room the first day. Bought 3 more to protect our kids.
★★★★★
You Can't Smell It.
You Can't See It.
But Now You Can.
Join 100k+ british homeowner & ditch your old detector to save your family.
PROTECT YOUR HOME
Most homes need 3-6 units for full coverage
FREE SHIPPING
Get all orders with free international shipping.
99-DAY TEST DRIVE
Try it risk-free. Full refund if you're not satisfied.
LIFETIME WARRANTY
Fails in 5 years? 10 years? We replace it. For free.