First Alert CO710 Carbon Monoxide Detector

The First Alert CO710 is a carbon-monoxide-only alarm powered by a built-in 10-year lithium battery, with a backlit digital display. It suits bedrooms, hallways and rentals where there is no convenient outlet and nobody wants to remember battery swaps. What sets it apart is combining sealed long-life power with a screen that shows the current CO concentration, room temperature and a peak reading of the highest level it has measured, so you can spot a problem that never reached alarm level.

Specifications

Specification	Details
Detects	Carbon monoxide only
Power	Built-in 10-year lithium battery; no wiring or outlet
Display	Backlit digital screen showing CO concentration and temperature
Peak level	Shows the highest CO concentration measured
Alarm	85-decibel horn at dangerous CO levels
End-of-life signal	Yes, a chirp when the unit should be replaced
Sensor type	Not stated in listing
Size / warranty	About 4.75 x 2.6 x 0.9 in, 0.4 lb; 10-year limited warranty with proof of purchase

First Alert CO710 — sealed 10-yr lithium, backlit CO + temperature display, peak level, 85 dB, 10-yr limited warranty

How It Compares

The Only Battery-Only CO Alarm on the Shelf With a Screen

Of the 17 similar listings we compared, three are not household wall alarms: an industrial four-gas monitor, a handheld CO meter and a 12-volt RV detector. Among the rest, five listings are battery-only, CO-only alarms: two Kidde AA models and three pack sizes of First Alert’s basic battery alarm. None of those five describes a display. The five shelf listings that do mention a screen all plug into an outlet.

The CO710 is also the only listing in the group that names a sealed lithium battery, and none of the others mentions a temperature readout. Its peak-level feature matches the one on First Alert’s plug-in display model; five Kidde listings describe a memory feature, but in terms of when CO was last detected or tested rather than a displayed peak number.

A few gaps are worth knowing. The listing says First Alert alarms are tested “to meet UL standards” but does not name UL 2034, which only two Kidde listings on the shelf spell out. It does not state the sensor type, while several First Alert and Kidde listings name an electrochemical sensor. It also does not describe a low-level warning threshold, so the display is the only early cue.

Who It’s For — and Who Should Skip It

Pick the CO710 for any spot where you want readings without an outlet: a bedroom, a basement guest room, a finished attic or a short-term rental. The sealed battery means no low-battery chirps for years, and the display gives more information than a basic horn-only unit.

Skip it if you need smoke protection in the same location (choose a combination alarm), want to detect natural gas or propane, or want a documented low-level alert and named UL 2034 listing. Hardwired interconnected alarms are also a better fit for new construction or remodels.

Using It at Home

Front Range homes typically run gas furnaces and water heaters, many have attached garages, and windows stay shut through long winters. Colorado law calls for a CO alarm within 15 feet of each sleeping room in homes with fuel-burning appliances or an attached garage.

• Mount it on a wall near bedrooms, at least a few feet from fuel-burning appliances, and away from bathrooms and direct sun.
• Check the display when you walk past; any nonzero CO number on a cold morning after the furnace starts is worth noting.
• Test monthly with the button. Write the activation date on the back and replace the alarm when the end-of-life chirp begins.

If it alarms, get everyone out to fresh air and call 911 or your gas utility. If the peak reading keeps showing elevated numbers without an alarm, the cause is often a furnace, water heater or blocked flue; contact us to have the combustion appliances and venting checked.

Related Guides

• Battery carbon monoxide detectors
• Low-level carbon monoxide detectors
• First Alert carbon monoxide detectors
• Carbon monoxide detector installation
• What to do when a CO detector goes off

As an Amazon Associate we earn from qualifying purchases. Product details come from the current Amazon listing; we have not lab-tested this unit, and prices and availability change.