This NVR comes with a formatted 1TB hard disk. I think this NVR boots from a flashed ROM so the user can just swap out hard disks without incurring any penalty. This is in case they need to either replace or upgrade hard drives in the future. If not, then they can always clone the drive and resize partitions appropriately via software means like Macrium Reflect, assuming that they were to use a higher capacity hard drive.This NVR lacks a WIFI chip so it must be connected to a router via an Ethernet cable so FYI. To use, connect everything from LAN, cameras, displays, power, and so forth. Boot up the device and simply follow the on-screen prompts of the startup wizard. All in all, it was a turn-key experience; very easy to configure and use. Then, download the app available on both Android and Apple platforms for absolutely free at no cost. Add additional users as one sees fit. The user can further incorporate this into their Smart Home system as well depending on which ecosystem they are using but that's beyond the scope of this review.Moving on, the "AI" keyword just indicates that it's programmed to detect humans apart from simply turning on the hard drive to save when motion has been detected. It's not bad, but it needs some tinkering by a human user to prevent false positives. In other words, not AI in the slightest. Other systems, notably Reolink or UniFi, has a more sophisticated "AI" detection. These are able to tell apart persons, vehicles, and animals with high accuracy right out of the box. So safe to say, Defender is falling behind with the times for the time being.The cameras though are something else. They're rated IP65 which means they'll shrug off downpours after another unless they were to be completely submerged in water. It can rotate 360 degrees and tilt up and down 90 degrees. It can track and follow moving objects on its own or by user's input from either the web interface or via app alike. As with all modern surveillance cameras, it also supports two-way audio for quick, strictly verbal communications. Last but not least, it can be programmed to light up, sound an alarm, and just make a racket with blinking lights with the intention to scare off any intruders.To close, this is an excellent NVR surveillance system without being tied down to a predatory subscription model to use for a lifetime. All of the cameras support up to 4K in resolution, although I wouldn't actually recommend that resolution to be used unless strictly for live viewing purposes. This, due to the amount of processing overhead and storage required to maintain it, especially if the user intends to use all four cameras simultaneously.That said, it's way too overpriced even if the bundle consists of 4 weatherproof cameras. There are household brands that can be had for less than $400. And you know what? It can be had for even less, if the user were to employ other means to store their footages. FTP to a NAS drive, anyone? At any rate, it's a good system that I'd seriously consider for $400 or below moving forward.

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Goodhome surveillance system. Very easy to install and setup and use. I am not electronics savvy and managed to figure it out. Multiple screen arrangements that are very easy to set and change as cameras are added. The video is very clear and sharp with video settings easy to use. Recordings are easy to view and copy. It’s easy to set up and connect, I just had to but a couple of longer cables for outback. The hardest part of the system is to figure out where I wanted to put the monitor and the system in the house. In summary.. It's a great surveillance system for the money. and add on cameras are easy to find.