My ESL 523CS smoke detector with heat. According to the manual, the detector is made from 1981. Had to repost, because of the pictures were not big enough. : r/firealarms
vtg ESL 509C Photoelectric Smoke Detector w 135° Heat Sensor NEW Old Stock 4wire | eBay
Fire Prevention Week: Replacing old smoke alarms is key to staying safe - Nelson County Gazette
My ESL 523CS smoke detector with heat. According to the manual, the detector is made from 1981. Had to repost, because of the pictures were not big enough. : r/firealarms