This kit is amazing, couldn't be happier. This is eufy's first NVR PoE camera system and I was amazed with it.S4 cameras are 2 in 1. Bullet + PTZ. You can have 2 separate views at the same time or you can have the PTZ on auto patrol covering even larger areas.- NVR. It came with 2tb HDD, supports 24/7 recording, has 8 ports in the back, plus 1 for lan, USB A slots, and USB C slot. Storage is upgradable upto 16tb. I ran cat6 throughout my home. Crimping Passthrough cables was a good choice I made.- Bullet + PTZ.This camera can be setup where both parts of the camera are linked with each other. For example, if bullet camera is facing driveway, and PTZ is facing the side yard, when motion is detected in driveway, the PTZ will turn towards driveway and capture the action.- AI tracking and Auto framing.One of the functions in PTZ is AI tracking and auto framing. Let's say if you walk by the camera, the PTZ will lock on you and keep tracking you. With time as you'll put distance between you and the camera, the telephoto lens will kick in and auto zoom on you while tracking. This has been very useful.- Live Cross-Camera tracking.I love it. Works between S4 cameras. You can set a "hot zone" in one camera, and add another camera as a "relay" device. What this does is once the first camera detects motion, it triggers the 2nd camera to turn around so you can track it from multiple angels.- Smart search.This feature has been very helpful. You can search by keywords and AI will show you the results. For example "person in blue shirt" or even "lawn mowing" showed exactly those results.- Spotlight/Alarm light.Cameras have very bright spotlight that turns on at night time. When the cameras are armed, that same spot light can be used, or the separate flashing blue/red lights can be used. That was awesome.Overall it's very good and I'd definitely recommend it.