120V AC/DC Slide load w/9V Batt. 5yr.War

This Firex Smoke Alarm is designed to sound an 85 decibel alarm at 10 feet and is powered by a 120VAC operating frequency at 80 milliamps. This sensor is engineered to work in between 40 and 100 degrees F with a relative humidity of up to 85%. Featuring an ionization sensor, LED display, and a mounting bracket that fits a single gang electrical box or up to 4in octagon box, it comes complete with a 9V battery backup and adjustable sensitivity of 0.5-0.92%. UL217, NFPA72, CA Fire Marshall, NFPA101, FHA, and HUD certified. Dimensions: 5.6in Diameter x 1.8in Depth.