Kidde® Smoke Detector Alarm, Tamper-Resistant, 9 VDC Battery, 10 ft, Ionization Sensor, Alarm: Audio, 85 dB Alert, Up to 85% Humidity Rating, 40 to 100 deg F Operating, Plastic, White, 4 in Dia x 1.45 in D
The fire Sentry i9040 smoke alarm is a battery operated smoke alarm that utilizes ionization sensing technology. The four 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 VDC 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.