Customer Reviews For The DeNova Detect 10-Year Battery-Powered Carbon Monoxide + Natural Gas Alarm

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Carlos G

November 27, 2025

Verified Purchase

The Best Detector in the Market

Easy and simple to install. Ten years battery life. Very compact and blend with interior house. Detects Carbon Monoxide and Natural Gas Alarm at lowers levels than others in the market. The price is very reasonable compare with other brands. I recommend this detector to anyone.

When should I replace the alarm?

The natural gas and carbon monoxide alarm should be replaced when the End-of-Service-Life (or EOL) Alert activates on your device. When this happens, the Trouble (Yellow) LED on the device will begin to blink twice every 10 seconds, and the audible alert will beep twice and say "Please replace detector" once every minute. This will occur approximately 10 years after device installation.

How do I open the battery cover and install the battery?

Open the battery cover on the back of the detector.
This cover slides out of place. To open, place both thumbs on the back of the battery cover where the battery cover hooks snap into place.
Push down where the battery cover snaps into place with your thumbs and slide the cover out. Some force is required.
Connect the included lithium battery by inserting the battery harness connector into the product.
Do NOT remove the plastic wrap surrounding the battery pack.
The battery connector has a large notch on it that faces up when installed correctly. There is only one way in which the connector can be installed. A small portion of the connector will be exposed when connected properly. You should hear it click into place.
After connecting the battery, place the battery with the labels facing down and the battery wires wrapping around the top side of the battery pack. For the best fit, it is recommended to have the negative (-) terminals face toward the outer edge of the detector.

What should I do if the DeNova Detect Natural Gas Alarm Sounds?

If at any time your natural gas detector's alarm sounds or if you ever smell or hear a natural gas leak:

Evacuate immediately and take others with you.
Do not use a phone; light a match; turn on or off lights, flashlights, or appliances; start a car; or do anything else that could create a spark or flame and cause the gas to ignite or explode.
Call 911 once you are safely outside the premises. You can report leaks anonymously.
Do not re-enter the premises until told to do so by authorities.

In the event of a gas leak, you may smell natural gas before the natural gas detector's alarm is activated. Whether or not the unit's alarm is sounding, if you smell gas, act fast. Report the leak once you are safely outside.

How do I recognize a gas leak?

Smell - A distinctive, strong odor similar to rotten eggs
See - A white cloud, mist, fog, bubbles in standing water, blowing dust, or vegetation that appears to be dead or dying for no reason
Hear - Roaring, hissing, or whistling

Will the natural gas alarm continue to operate if the power goes out?

Yes. Since the combination alarm is powered by an internal battery, the natural gas and carbon monoxide detector should continue to function during a power outage.

Will the natural gas detector monitor my home for smoke, fire, or other gasses?

No, the natural gas detector will only detect the presence of natural gas and carbon monoxide (CO) in the area where the unit is installed. It will not detect fire, heat, smoke or the presence of any other gases.

Will the natural gas detector monitor all areas of my home for possible gas leaks?

No, the natural gas detector will only monitor the air in the area where the unit is installed. Natural gas leaks could be present in other areas and/or on other floors of your home or building without reaching the natural gas detector. As such, the unit's alarm may not sound in the event of a natural gas leak in a remote part of your home or building. Doors or the obstructions may also affect the rate at which natural gas reaches the natural gas detector. You should install separate gas detectors as needed in other areas of your home where natural gas appliances are used.

If the natural gas alarm’s audible gas leak alarm is activated, will it be heard throughout my entire home?

No, the natural gas detector's alarm may not be heard in all rooms or situations. Since the natural gas detector is installed in a limited area of your home or building - such as the kitchen, for example - people sleeping or awake in other rooms or on other floors may not hear the unit's alarm in the event of a natural gas leak. People may not hear the alarm if the sound is at a distance and/or blocked by closed doors and/or other obstructions. Noise from traffic, stereos, radios, televisions, air conditioners, appliances, or other sources may also prevent people from hearing the unit. The unit's alarm is not intended for people who are hearing impaired.

The DeNova Detect DD623NCV is America's first and only 10-year battery-powered combination natural gas and carbon monoxide alarm. Designed for fast, reliable detection and equipped with a powerful speaker and LED system. With its 10% LEL alarm threshold, it helps safeguard lives by giving users more time to respond in emergencies.

This innovative alarm features MEMS hot-wire semiconductor technology for natural gas detection that is validated to detect explosive levels of gas faster than conventional plug-in alarms. In combination with an electrochemical CO sensor, this dual-sensor unit meets strict UL standards for accurate natural gas and CO monitoring.

Unlike traditional units, the DeNova Detect DD623NCV doesn't require an outlet or battery replacements. It also eliminates false alarms from everyday household chemicals, making it ideal for families, landlords, and utility partners.

The alarm speaks directly to the user with voice alerts in both English and Spanish, giving life-saving instructions like "Danger, gas leak explosion risk. Evacuate, then call 9-1-1" during a gas leak or "Danger! Carbon Monoxide Detected!" in the event of CO exposure.