Most detectors only show a green light — which stays on even when the sensor is dead. They don't alarm until 50 PPM, which can be AFTER 60-90 minutes 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 by Gas Safe engineers on callouts. They detect real threats, not toast or steam from the kettle.

Sentinel is a 4-in-1 detector. It monitors carbon monoxide, natural gas, temperature, and humidity. This is a critical distinction. Most cheap detectors from B&Q or Screwfix only detect CO. If your gas hob leaks, your boiler has a fault, or your water heater line is compromised, those detectors stay completely silent. Sentinel catches all threats in real-time, with PPM readings on the display starting at 0. One unit. Complete protection. No gaps.

Sentinel plugs into any standard UK wall socket (even if your socket are at ground level) no ladder, no tools, no electrician. 30 seconds and you're protected. For placement, focus on two priorities: near gas appliances (boiler, gas hob, water heater) and in hallways outside bedrooms where your family sleeps. Most families start with one near the boiler, one in the kitchen near the hob, and one in the hallway outside bedrooms. The 4-Pack covers most homes completely.

No. Plug it into any UK socket. That's it. Takes 30 seconds. No ladder, no tools, no electrician.

One per floor + near bedrooms + near gas appliances (boiler, water heater). Most homes need 4. Flats 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 without relying on family to check on them.

You're covered by our 30-Day Money Back Guarantee. If you're not satisfied for any reason, we'll refund every penny. No questions asked. Plus, the Lifetime Guarantee means we replace it free if anything ever goes wrong.

Hardwired means it runs on mains 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.

We ship from our warehouse. 8-10 business days typically. Free delivery on all multipacks.