Are X-Sense Wireless Interconnected Smoke Detector Fire Alarm really that good? 

CR123A batteries can now be found in the battery displays of your local Walmart.

Is there a video on connecting the app to the device? I’m having issues

Excellent video loud and clearly explained 👍

Holy code violations on that electrical panel. All that romex needs to be secured within a foot of entering the panel

Buy This Item Here - amzn.to/3OW2jSG

10 years. Battery life

Except you weren't smart enough to get the version with a phone tie in so you can get alerts when not at home.