Get NEST- they have smart door locks, cameras, thermostats, doorbells, smoke detectors and more. You install in seconds.. or.. call MUNNS heating and AC they are an authorized dealer. (and they install they give more warranty)

I had MUNNS do the hard stuff.. Thermostat. (I wasn't 100% sure) rest was easy.. doorbells wired - unscrew and add . Nest has facial recognition and if you have the nest smart lock can auto open for that person. Key-less world!

Smoke detector is carbon and smoke (10 yr) no battery to replace is wired w/battery backup. has a motion sensing night light, walk under it illuminates. (can disable too)