[4K Ultra HD and Color Night Vision] This incredible 4K CMOS image sensor allows the camera to capture more light, resulting in improved color, contrast, and low-light performance. With 4K resolution, you can record everything in stunning detail with high pixel count and digitally zoom in on objects in the distance without losing any quality. Experience the ultimate clarity and enhanced visibility with our advanced technology. | [Face/Person/Vehicle Detection with Push Alerts] Our AI-powered detection feature intelligently identifies faces, people, vehicles, or other objects, reducing unnecessary notifications. Whenever a motion event is detected, you'll receive instant push alerts through the app and email notifications. Stay on top of any activity with our advanced detection technology. | [Dual-Disk Backup for 24/7 Recording] Our dual hard drive design supports extended continuous recording and USB backup. It can accommodate up to two 6TB hard drives (not included). With a built-in 4TB secure-grade hard drive, you can rely on it for reliable all-day recording. The NVR can be set to automatically overwrite the oldest stored footage or transfer these video files to a USB thumb drive or external hard drive via USB. | [Two-Way Audio & Remote Access] Equipped with built-in microphone and speaker, our product allows you to have real-time conversations with your family, communicate with colleagues at work, or greet visitors at your door, all through our free mobile app. With support for multiple user connections, you can share camera view with your family. And you can remote access and playback anytime, anywhere on your phone. | [4K 16-Channel NVR Upgrade to 24CH Expandable] Upgrade your 4K 16-channel NVR to a 24-channel system with our expandable solution. Simply add a PoE switch (not included) and you can expand your system to support up to 24 PoE cameras. This gives you the flexibility to add additional cameras according to your needs. You can integrate more (ZOSI only) 8MP, 5MP, 4MP, 3MP, or 2MP PoE cameras to enhance your surveillance.