Who's There Answer from Anywhere! The ALC home Security video doorbell is easy to install and replace your existing mechanical or digital doorbell, with minimal effort, wired power, and Wi-Fi-enabled connectivity. The 1080P Full HD video camera sees anyone approaching your front door, friend or foe, in crystal clear resolution day or night. Two-way audio lets you remotely answer your door to greet friends or warn off trespassers through the free downloadable app and WiFi connection. Use the built-in microphone and speaker from your smartphone to answer your door from anywhere in the world. Ringing the doorbell or motion detection automatically sends alerts to your smartphone or tablet when you are home or away 24/7. Triggered events record directly to a 16GB MicroSD card (included). Watch clips live or view recordings later. A safer, smarter home security choice is in the palm of your hands with live view streaming, on-camera recordings, and video clip transfers.