Safety

First Alert CO Detector — 10-Year Battery with Digital Display (CO710)

4.8 12 reviews 1 min read

First Alert CO Detector — 10-Year Battery with Digital Display (CO710)

Product description

This carbon monoxide alarm is supplied with the detector itself plus the simple mounting hardware needed to hang it on a wall or set it on a tabletop. The housing is durable plastic and measures about 5" x 2.5", allowing the unit to be unobtrusive on a dresser or a shelf. Inside is an electrochemical CO sensor, the preferred technology for accurate carbon monoxide measurement. The unit’s backlit digital screen shows the current carbon monoxide concentration and ambient temperature; a Peak Level feature captures the highest reading recorded.

Power comes from an internal 10‑year lithium battery, eliminating routine battery swaps for the life of the alarm. When CO reaches hazardous levels the device emits an 85‑decibel alarm; a test/silence button lets you verify operation or temporarily mute nuisance alerts. The alarm also produces an end‑of‑life chirp when its service period ends. Built and tested to meet UL safety standards, the detector includes a limited 10‑year warranty from the date of purchase when proof of the original receipt is provided.

Pros

  • Long-life 10-year lithium power
  • Backlit display shows CO and temperature
  • Electrochemical sensor for accurate detection

Cons

  • No continuous CO-zero indicator on the display
  • Not as compact as some ultra-small units
  • May need relocation for ideal coverage in larger homes

VerdictA straightforward, dependable carbon monoxide alarm that uses an electrochemical sensor and a decade-long internal lithium battery to provide long-term CO monitoring. The clear backlit display reports current CO and temperature and stores the highest reading, while an 85 dB horn and a test/silence control allow quick verification and temporary quieting. It’s simple to place on a dresser or mount o

Reader reviews

  1. Wayne 5/5

    Great for Hot Tents

    Ideal for use in my hot tent — compact, shows temperature, and the long-life battery is a huge plus.

  2. Kate 5/5

    Glad I Bought It

    After years of owning it, the alarm actually saved us by sounding in the night. Portable and ideal for trips or boats. Highly recommended.

  3. holly nichols 5/5

    Does Its Job

    Simple and effective — does what it’s supposed to do.

  4. Kimberly C. 5/5

    Perfect for Frequent Trips

    Bought it before a stretch of travel where CO detectors were inconsistent; it’s compact enough for carry-on and gives real peace of mind. Still running on the original battery after years of use.

  5. Electron Lover 5/5

    Dependable Long-Term Protection

    My previous First Alert lasted about a decade before its end-of-life chirp, so I bought the same style again. Setup was quick using the provided instructions and I mounted it where the manual recommends.

  6. Taha 4/5

    Works Well, Battery Was Shorter Than Expected

    Practical and effective in daily use. I expected a longer battery life but it lasted a couple of months for me; there is a plug-in option to keep it powered continuously. Good value overall.

  7. Squid & Jelly's Great Adventure 5/5

    Travel and Boat Essential

    We bring this CO alarm everywhere — boats, rentals, and trips. Once we forgot it on a mountain and woke with headaches after a fire in the hut; now it’s always in our pack. Battery life has been excellent, the temperature readout is handy, and the alarm is loud enough to wake you.

  8. Len Berg 5/5

    Well Thought Out

    Exactly as described with clear installation steps and included fasteners. The long-life battery is a welcome feature.

  9. Kindle Customer 5/5

    For My Son’s Dorm Room

    I purchased one for my child heading to college. Dorms and rentals may not keep detectors maintained, so this portable unit gives extra peace of mind. Small footprint and easy to place on a shelf or dresser.

  10. Doug Slupski 5/5

    Reliable Placement Anywhere

    Performs well. Because it’s battery powered, you can set it wherever needed without worrying about an outlet.

  11. Tom 5/5

    Five Stars — So Far

    So far it’s been excellent. With a 10-year battery I’ll revisit this review down the road.

  12. Observation123 4/5

    Small, Functional CO Monitor

    Compact at roughly 5" x 2.5" and unobtrusive on a dresser or wall. I like the constant temperature readout; I wish the display showed a zero CO reading to reassure you it’s active, but otherwise it’s solid.

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