408-0914E Features: -Test Button – Tests unit’s electronic circuitry, horn, and battery function. -Low Battery Indicator – Smoke alarm will chirp in the event of a low battery. -Red LED – Flashes every 30-40 seconds to indicate that the smoke alarm is receiving power. -Dust cover. -Sensor Type: Ionization. -Type: Smoke Detector. Product Type: -Smoke Detector. Orientation: -Wall/Ceiling Mounted. Power Source(s): -9V Battery. Mounting: -Wall. Compliance, Standards: -UL Listed. Generic Specifications: -Batt. Size: 9V. -Sound Level: 85 dB. Dimensions: Overall Width – Side to Side: -3.88″. Overall Depth – Front to Back: -3.88″. Overall Product Weight: -0.37 lbs.