Aegislink Photoelectric Smoke Alarm S220 with Battery non ReplaceableEnsure your homes safety with the Aegislink Photoelectric Smoke Alarm. Featuring a long lasting, non replaceable battery, this reliable alarm detects smoke early to provide timely alerts. Its photoelectric sensor is designed to reduce false alarms while effectively sensing slow smoldering fires. Easy to install and maintain, it offers peace of mind by safeguarding your family and property around the clock.