🔥 Stay safe with the LSHome Photoelectric Smoke Alarm 4-Pack! 🔋 Battery Operated: Powered by 9V D.C. batteries for easy placement anywhere. 🔍 High Performance Sensor: Advanced photoelectric technology detects smoke quickly and reliably. ✔️ Big Test Button: Easily test your alarms to ensure they are working properly. 🚨 4 Pack: Enough detectors to cover multiple rooms or floors for complete home protection. Keep your family secure with reliable smoke detection. Easy to install and maintain for peace of mind.