You'd think that smart door locks and home security systems would regularly work in harmony, but that's not really the case. More likely than not, you'll have to remember to check the lock after the fact. Not so if you have August's Smart Lock Pro -- the company has forged a partnership that integrates Protect America's home security hardware. You can now use Protect America's Alexa skill to automatically lock the door when you arm the security system, so you hopefully won't have to test the resilience of your system by giving thieves an easy entrance.