This is the summary of consumer reviews for Kidde i12040 120V AC Wire-In Smoke Alarm with Battery Backup and Smart Hush. The BoolPool rating for this product is Very Good, with 4.10 stars, and the price range is $7.98-$13.97.

The Kidde i12040 is an AC/DC powered, ionization smoke alarm that operates on a 120V power source with 9V battery backup. The battery-backup feature (9-volt battery included) provides protection even during power outages. The smoke alarm can be installed on any standard single gang electrical box, up to a 4” octagon junction box. The electrical connection (to the alarm) shall be made with a plug-in connector. This alarm is also compatible with older model mounting bases and thus is very easy and quick to setup or replace. The smart interconnect system connects with up to 24 Kidde devices--including other smoke alarms plus carbon monoxide and heat alarms.

By pressing the hush button, you can easily and safely silence nuisance alarms caused by non-emergency situations, such as overcooked dinners. The alarm includes a test button that will electronically simulate the presence of smoke and cause the unit to go into alarm. This sequence tests the unit’s electronics, battery and horn to ensure proper operation. The unit has red and green LED indicators. The green LED (when illuminated) indicates the presence of AC power. The red LED (located under the TEST/Hush button) has four modes of operation: Standby Condition, Alarm Condition, Alarm Memory and Smart Hush Mode.

Overall, the Kidde i12040 is an easy to install, safe and secure smoke alarm with very reasonable price for its various features. This smoke alarm is available in a 6-piece cut case with tray for easy display as well as a 6-piece bulk pack for contractors and property owners. This unit is a UL Listed product with a 10-year limited warranty.