【4K Ultra HD Surveillance with Dual Night Vision】--8MP 4K Resolution captures razor-sharp details for facial recognition and license plate identification, with zero blur during 4x digital zoom. Starlight Color Night Vision (built-in spotlight) delivers vibrant nighttime footage, while infrared B/W mode provides 100ft visibility in total darkness.Military-Grade IP66 Metal Housing for 24/7 outdoor/indoor protection [16 PoE Ports, Expandable to 32 Cameras]--Upgrade your 4K 16-channel NVR to a 32-channel system using our expandable solution. Simply add a PoE switch (not included) to support up to 32 PoE cameras. It can only compatible with ZOSI 8MP, 5MP, or 4MP PoE bullet or dome cameras to suit your specific needs(Not compatible with other brands). 【AI-Powered Smart Detection】--Advanced Person/Vehicle Filter reduces false alerts by 90% (ignores pets/shadows) with 99.5% recognition accuracy. Instant Mobile Alerts via ZOSI App when human/vehicle motion detected, with customizable detection zones. Forensic Search Features - Quickly locate events by person/vehicle type with smart timeline. 【Two-Way Talk + 24/7 Remote Access 】--Talk to Visitors: Built-in mic & speaker let you scare off intruders or greet delivery drivers remotely.Free ZOSI App: Monitor live feeds or review recordings anytime on iOS/Android—no extra fees. 【4TB Hard Drive + No Subscription Fees】--Pre-Installed Surveillance-Grade 4TB Hard Drive supports 24/7 recording for 30+ days (based on 8 cameras).Smart Auto-Overwrite or manual backup to USB for critical evidence preservation.Expandable to 16TB (dual 8TB HDDs supported) for commercial-grade storage needs.