9. Smart lock
Digital lock (or smart lock) is a sufficient part of a security system of a modern home. As a traditional deadbolt it will lock/unlock a door. But it can also let you check who is entering and living your place and to manage access when you are not around. The «smartest» locks can even send limited temporary keys to your visitors or service workers by e-mail.
Normally, for a digital lock you can program particular rules for day/night/vacation. In case you are worry about losing control during a power outrage, you can pick a lock like Kwikset’s Kevo, running on batteries. Smart lock batteries last between six months to a year, and the app on your smartphone lets you know when they need replacing.