[4K 16CH Expandable Camera System] With this 16-channel 8MP PoE NVR, you have the option to add more cameras. You can add an additional 8pcs 8MP, 5MP, or 4MP POE bullet or dome cameras(ZOSI cameras only). [5MP Ultra HD with Color Night Vision] See Every Detail in Crystal-Clear 5MP HD: Experience vibrant colors and sharper contrast day or night. An advanced CMOS sensor captures more light, providing superior color night vision instead of black-and-white. [Smart Person/Vehicle Detection & Alerts] Fewer False Alerts, More Relevant Notifications: Our smart AI accurately distinguishes between people, vehicles, and other motion. Only get alerted what matters. Receive instant push notifications and email alerts on your phone when a person or vehicle is detected, so you can act immediately. [2-Way Talk & Sound-Light Alarm to Deter Crime] Communicate and Scare Intruders Away: Use the built-in mic and speaker for clear two-way audio. Talk to family, greet visitors, or warn delivery drivers. For security threats, activate the built-in siren and strobe light directly from the app to effectively scare away trespassers and would-be thieves. [No Monthly Fees,4TB Hard Drive for Local Storage] Total Privacy and Control with Zero Costs: Your data is stored securely on the included 4TB hard drive, not in the cloud. This eliminates monthly fees and protects your privacy from cloud hacking. Evidence is always safe with auto-overwrite or USB backup options.