Oh okay. Those GE’s made a high pitched squeal as well. There were also ones with a lower pitched buzz. What did yours sound like? Glad you got it replaced. The Sears alarm my parents had made an irritatingly high pitched squeal and when it went off you knew it. Same with the Dicon which was worse than the Sears. Smoke detectors of that time were alot more serious and frightening sounding than they are today. Piezos in my opinion don’t do the job like electromechanical horns did. My parents replaced all their alarms in 1997. They should have been replaced much sooner as they were in the house when we moved there in 1981 and were probably there 5 years before. I talked my parents into replacing them and Im glad they listened. The sears alarm in your pic looks to be the same one my parents had so I wouldn’t be surprised if it sounded the same. If you do decide to put a battery in it and test it cover your ears those things are loud!!!