It was easy to snap the battery pack onto the back, all I had to do was line up the Pins , and snap it in! It started working and flashing the light as soon as I snapped it in to indicate it was working, I gave the battery a test to see that it was working , It was certainly loud enough to wake you up in case of a fire, would recommend this to anyone, When the 10 years is up ,simply throw it away the battery cannot be taken out. There is a place inside the battery pack to write down the date you activated the battery. I would definitely recommend this product to anyone.
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