This is the summary of consumer reviews for Kidde i9040 Fire Sentry Battery-Operated Ionization Sensor Compact Smoke and Fire Alarm. The BoolPool rating for this product is Very Good, with 4.30 stars, and the price range is $3.99-$8.75.

Kidde i9040 Fire Sentry is battery operated single station smoke alarm that utilizes ionization sensing technology. This compact unit is 4 inch in diameter, giving it a discreet design and clean looks. It is powered by a 9 volts battery and installs quickly without wires. This easy to install unit includes a test button that allows you to periodically check the circuitry, horn, and battery function. Also, a chirping sound makes it clear when it is time to replace the battery. This unit is UL Listed and includes a shelf life of 10 years and a 3 years limited warranty. Kidde strongly recommends that both ionization and photoelectric smoke alarms be installed to help insure maximum detection of the various types of fires that can occur within the home.

The i9040 is not a dual sensor fire alarm and its test button is very loud.

Overall, the Kidde i9040 Fire Sentry is a highly recommended basic alarm system for its easy to use features and affordable price.