【Person Vehicle Detection& Alert Push】Precisely Detect Person Vehicle,The camera is smart enough to detect people or vehicles from other objects and safely reduce unwanted notifications.you will receive instant App push notifications,email alerts and sound alarms (siren) when motion events are detected. | 【Two Way Audio & Sound Light Alarm】The 4pcs PoE IP camera Built-in mic and speaker let you stay in touch with your household. So you can talk to your kids or tell your dog to stop barking, or say hello to the delivery man through the Free Zosi Smart App. And you can set the cameras will switch on ultra bright spotlight and sound siren once human detected to scare intruders away | 【4K 8 Ports NVR Upgrade 16CH Expandable】This 4K 8-port NVR can expand up to 8 PoE cameras. If you additional purchase a PoE switch (not included), you can update to 16 channel system. It provides you with the flexibility to expand additional cameras. You can add more (ZOSI only) 8MP, 5MP or 2MP POE bullet heads or dome cameras. | 【Stable Plug and Play PoE System】A simple PoE connection makes it easier to set up and install your home security camera system. The digital signal will keep a real 8mp high-definition image via ethernet cables. | 【24/7 Recording with 2TB Hard Drive & Live View Share】Built-in 2TB Security Grade Hard Drive, users are provided reliable 24/7 recording.Support long continuous recording and backup.NVR can be set to automatically overwrite the oldest internally stored footage or you can transfer those video files by USB to a memory stick or external Hard Drive. And it supports remote access, live view and playback by multiple family members.