Order this Kidde Smoke Detector – Battery Powered with Ionization Sensor for delivery to your job site. Easy to install – powered by one 9-volt battery. no hardwiring required. Protection during power outages and no low battery chirps. 85 decibel fire alarm alerts of fire. Ionization sensor technology detects invisible fire particles. Ensure whole home family protection by placing 1 fire detector and carbon monoxide detector on each level of your home, in your bedroom, & other locations where required by law. *Check with your state and local fire and Building/Safety codes for specific information regarding smoke & Carbon Monoxide Alarms.. UL/CSFM Ref. Kidde Part i9040.