I bought this relay to connect wired smoke alarms to my existing alarm system. My smoke alarms are First Alert and I originally bought their relays for almost double the price. It worked once for about 2 seconds and then didn't work again so I returned it and bought this one. Zero issues, tested on a workbench and then field tested and had no issues at all. It all contributed to the apparent non-functioning of the Leeo monitor I've had for about five years following the company's bankruptcy later this month. Your device is listening for smoke and other alarms and ringing on my phone. So using this relay was at least a partial alternative.
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