Turn your phone into a smart key.

Keys have been around for a long time and are good enough for most people, but if you feel like it should be more versatile and functional while still being secure, you should get the August Smart Lock HomeKit. This security device turns your smartphone into a smart key that can lock and unlock your door via your phone remotely, as well as monitor who enters the door from anywhere. It is compatible with most standard deadbolts and if its battery runs out you can still use your key to manually open the door.

Buy on www.amazon.com
$151 - $300