If you're like me. You may have setup your home or apartment with a smart fire alarm. In my case, I chose to get a z-wave network. In hindsight, it may have been cooler to run with the open standard of zigbee but whatever.
I recently purchased a z-wave enabled POP fire alarm with an article number of POPE004001. I had some issues finding the z-wave button and pressed the alarm indicator / test button several times in vain.
After a while, getting frustrated on the bad instructions that followed with the device, I finally realized what the button was. It looked nothing like the instructions.
Press and hold the z-wave button for 1 second to pair it with your z-wave controller and press and hold it for 3 seconds to set it up with encryption.
You're welcome. :)