【4K PoE / IP NVR w/wide compatibility】This PoE NVR is compatible with Hiseeu PoE camera, supporting resolution up to 4K/2K/8MP/5MP/3MP/1080P,but limited compatibility with other brands cameras | 【8 Channel PoE NVR 16CH Expandable】This NVR built-in 8 PoE ports, can power on 8 PoE cameras at the same time over Ethernet cable, can extend up to 16 channels via a PoE switch(no included), max up to 16Pcs 4K 8MP cameras.If you need extra poe switch,you can search B09LH7P41X on Amazon | 【Easy Remote Access & No Monthly fee】 Free APP "Guard Viewer" can be downloaded from App Store or Google Play. At anytime anywhere, we can view the live video remotely via phone APP or software "Guard Station" on PC/Mac/Tablet | 【No Hard Disk Drive included】This NVR unit doesn't come with a hard disk,and supports up to 12TB HDD.NVR can’t record playback videos without a HDD.If you need an extra hard drive,you can search B07DW4YGYM on Amazon | 【Advanced H.265+ Video Compression】Advanced H.265+ technology can efficiently save hard drive storage up to 50%, for delivering sharper and smoother video streaming (No Hard Drive Included) | 【Instant Motion Alerts on Customized area】The user can randomly customize the detection area,once the system detect some suspicious moving objects, smart alerts on App, Email, NVR will be triggered instantly through APP or Email | 【Human & Vehicle Detection】To differentiate between humans, vehicles, and non-important objects in the scene, you will have a colored box surrounding humans and vehicles. A green box will outline pedestrians with intelligent mark enabled in the camera, blue box for motor vehicles. With Human and Vehicle Detection feature you could be alerted any time when a person or vehicle entered your propert（ Important Notes: Only Hiseeu PoE camera can support these functions） | 【12 Month Warranty & Friendly Customer Support】We provide a full warranty for 12 months of this NVR.If you have any question, don't hesitate to get in touch with us, we will try our best to satisfy you