Photoelectric Smoke Detector with 10 Year Sealed Battery An easy-to-use photoelectric smoke alarm that needs no battery maintenance during its 10-year lifespan. Simply engage the internal battery by releasing the pin on the unit's base, fix to your desired surface and test regularly. Once the detector nears the end of its 10 year life, a low battery indication alerts you to replace the unit. This model also has a hush feature to reduce the unit's sensitivity for a ten-minute period when require
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