I had installed a q - see 8 channel camera system years ago. It's only 720P and lately I've been having problems with it. I decided to upgrade to a 1080p system. I already have ran a cable through my attic and but I only need to disconnect my 720p cameras and replace them with the new 1080P ANRAN cameras. I started off the install with disconnecting my old DVR and connecting all of the BNC connectors to the new ANRAN DVR. My next step was to go take down two of the old cameras and install two of the new ones in their place. That was easy enough because I already had the holes drilled in my Eve and all the cables ran. The cameras are a little tricky to get positioned as they articulate at three different points and you will need a hex head or allen wrench to loosen up these points so that you could swivel the camera and turn it to the position you need it at. All cameras require you to loosen pivot points to set them up but I was able to get all of these adjusted and pointing to the areas I wanted to view. I then went back in to look at it the cameras on my TV which is connected to the DVR via HDMI. Holy cow, I was not expecting this much of a video improvement. My TV is a Samsung 4K and as upscale but the former 720p cameras were never this clear even being upscaled by my TV. After seeing this tremendous video improvement, I couldn't wait to finish getting the rest of the cameras installed. I next downloaded the Danale remote viewing app to my cell phone. I took a minute to read some of the reviews left for this app on the play store and there are some pretty bad ones. But the app works fine for me and I don't understand why people were complaining. The only negative thing I good Vine about the app was that you can only view for cameras at a time. but that's not a deal-breaker and you can just press camera number 5 and the other four cameras populate. If you click on one of the four videos you can enlarge it and turn your phone sideways to get full screen. I was able to look at my cameras and do fine-tuning adjustments on each camera to get them pointed exactly where I wanted. Be careful holding a camera in your hand while you're adjusting cameras up on a ladder. The camera app was easy to pair and I just scan the QR code after hitting the network link on the DVR from my TV. The phone app asks you for your Wi-Fi password, but I don't recommend entering in your Wi-Fi password. If you look below that there's a QR code link that opens up a scanner and just pointed at your TV. if you don't have your TV next to it then you can connect the HDMI cable to a monitor. I then proceeded to download the Danele viewing app for a PC. I got that installed and there's a search button which immediately found my DVR and added it. I was unable to view my video cameras over my computer as well. My old q-see system allow me to access my DVR from my computer and pull video off the DVR hard drive from my computer. Unfortunately this viewing app on the PC does not have this capability. After researching and trial and error, I figured out how to access the recorded footage. You need to do it from the DVR. You just right click on the screen whether it's on your TV or a monitor and click on record playback. This allows you to search the cameras and the dates and if you I have a section that you want pulled off, then you plug in a USB thumb drive into the back of the DVR and save it there. So say you recorded a theft and me to give it to the police and this is how you would pull the video off so you could give them the footage. I prefer to be able to access the DVR from the computer app but it's not a deal-breaker. Also for $3 a month you could subscribe to their cloud service and have 3 days worth of recording available from the cloud which is easier to access. So this is a another positive feature of this system. Next next test for me was how did it perform at night. Well I can happily report that the night vision on these cameras is amazing and far, far superior than my previous cameras were. And night vision on these cameras is excellent and I couldn't be happier. As with the phone app, the PC app only allows you to view 4 cameras in a square at a time. But that's not a deal-breaker for me either. I do wish that the PC app allows you to access the DVR and maybe through a port forwarding service I may be able to get that to work later. I will have to work on that. But for now I'm extremely happy with this system, the functionality and the incredible picture quality. This was a tremendous upgrade and I'm so happy with it that I uploaded a video so you can see it in action. Sorry for the long review but I just wanted to share my satisfaction with this system. I highly recommend it. Also I forgot to mention that I had a previous 1080p system that I sent back because the instructions were written very poorly. I took a chance on this system and the instructions are written as much better than the one I returned. I highly recommend this system!