Amaryllo ACR1501R1WHUS iCam PRO FHD Home Security Systems, White Smart sensor NETWORK: there are 3 motion sensors placed around the icampro. When motion is detected it will turn to face the movement and begin tracking Intelligent tracking system (its): our patent pending technology allows the icampro to track moving objects, such as an intruder Mechanized infrared-cut filter: this piece automatically changes lens helping the contrast in the sunlight and improving the infrared vision at night Real-time push picture alerts: with built-in motion and audio sensors, you will instantly receive a push text message when either one is triggered. On top of that, this service is free Two-way audio: talk with your loved ones from anywhere in the World