The lock has Wi-Fi and Bluetooth so it allows you to lock or unlock, share access and see who comes and goes all using your app, from anywhere! For ultimate convenience, your Assure Lock will unlock automatically as you approach the door and it will even relock once the door is closed! Plus, you can lock, unlock or check current status with voice assistants including Amazon Alexa, Hey Google or Siri. The lock features a backlit keypad so even when you don't have your phone, you can unlock your door without the hassle of keys. It's super easy to use and installs in minutes with just a screwdriver on standard doors (1-3/4" to 2-1/4" thick).