Linsoal RC425COM Smoke & CO Detector — 2-Pack

Two standards, two hazards, one housing

A combination smoke and carbon monoxide alarm is listed to two separate standards, and it is worth knowing they are not interchangeable. UL 217 covers the smoke side; UL 2034 covers carbon monoxide, setting alarm response as concentration-and-time pairs and equally requiring the unit not to sound at low concentrations, so nuisance alarms do not train people to ignore it.

NFPA 72, the National Fire Alarm and Signaling Code, governs placement and interconnection. The two hazards do not want the same location — smoke rises, while CO mixes fairly evenly with air — which is the practical argument for a combination unit outside sleeping areas, and against relying on one device to cover a whole floor.

Both sensing elements have a finite life that runs from manufacture, not installation. Smoke sensors are commonly rated to 10 years and CO cells to 7–10; the unit is replaced at the manufacturer's stated end-of-life regardless of whether it still chirps.

Frequently asked questions

What is the linsoal rc425com?

A combination smoke and CO detector, 2-pack. One unit warns of both fire smoke and carbon monoxide, saving a device and a spot on the ceiling while covering two of the most common home hazards.

How is it powered?

Confirm the power source on the listing - battery, plug-in with battery backup, or hardwired. Battery-backup and sealed-battery models keep working through a power outage, which is when some CO risks rise.

Where should I place it?

Follow the manufacturer manual and local codes: generally on every level and near sleeping areas, away from dead-air spots. See our CO placement guide for room-by-room guidance.

What do I do if it sounds?

Treat every alarm as real: get everyone to fresh air outside and call 911 or the fire department, then have the CO source found and fixed by a professional before returning.

Is it the same as an industrial CO monitor?

No. This is a residential early-warning alarm. Occupational settings where CO can reach IDLH levels need industrial gas-detection instruments and rescue procedures. Use the right tool for each environment.

Does it detect both smoke and CO?

Yes - a combination unit senses both smoke and carbon monoxide and signals which hazard triggered it. Confirm the sensor types (for example photoelectric smoke plus electrochemical CO) on the listing.

How long does it last?

CO sensors have a service life, typically several years, after which the unit must be replaced, not just re-batteried. Confirm the end-of-life date and replace the alarm on schedule.

How often do I test it?

Test with the button monthly and follow the manufacturer's maintenance schedule. A CO alarm you never test is a CO alarm you cannot trust.

Can it be interconnected?

Some models interconnect so one alarm triggers all. Confirm interconnect capability and compatibility on the listing if you want whole-home alerting.

Is it UL listed?

Confirm the current UL 2034 listing on the product page. A CO alarm should carry the applicable safety listing for residential use.

Does a CO alarm replace appliance maintenance?

No - it is a last-line warning. Have fuel-burning appliances, flues, and vents inspected on schedule so CO is prevented at the source, not just detected.

How do I order several?

Quantity purchasing runs through a free Amazon Business account - volume pricing, PO numbers at checkout, and tax-exempt eligibility for qualifying organizations. The bulk-ordering walkthrough is linked in our footer.