Picks up gas before you can smell it,
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This review is from: Mains Powered Household Gas Detector (Electronics)
Bought this for an elderly relative who has had a couple of 'frights' after turning on the gas but then failed to light the burner. Luckily they smelt the gas.
Tried it before installing, and it'll "beep" loudly before you can smell gas, so must be sensitive. The alarm is quite loud, so even with a hearing aid should still be OK.
The red LED blinks every 40 seconds to let you know it's active. Not shown in the picture, it comes with a captive main leads and 3-pin plug