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If you're using a home automation hub to control things like lighting and thermostats, you can add a Z Wave or Zigbee smart lock to the system without much effort. Alternately, if you don't have a home automation hub, look for a Wi Fi or Bluetooth lock that comes with its own mobile app. Smart locks use standard pre drilled holes and are fairly easy to install. Some models use your existing keyed cylinder and deadbolt hardware and attach to the inside of your door, while others require that you remove your existing interior and exterior escutcheons and replace the deadbolt and strike hardware. Smart locks can be opened and closed using a mobile app and will send a notification when someone locks or unlocks a door, and most allow you to create permanent and temporary access schedules for family members and friends based on specific hours of the day and days of the week. Features to look for include geofencing, which uses your phone's location
services to lock and unlock the door, voice activation using Siri HomeKit, Google Assistant, or Amazon Alexa voice commands, support for IFTTT, and integration
with other smart home devices such as video doorbells, outdoor cameras, thermostats, smoke alarms, and connected lighting.