Sentinel 21009474 (i9040) Battery Operated Smoke Detector with Ionization Sensor

i9040 smoke alarm is a battery operated smoke alarm that utilizes ionization sensing technology. The 4 in. unit is smaller in diameter giving it discreet design with the same quality you would expect in a Kidde manufactured product. The i9040 is powered by a 9-Volt battery, providing continuous protection, even during power outages. This easy to install unit includes a test button to verify the detection electronics are working as intended. Battery operated (9-Volt battery included) easy installation and provides continuous protection even during power outages Test button