Shipping was fast. Video quality is good. 60ft cable length was insufficient and had spend more for 100ft cables. IR Motion detection is horrible at night. Triggers an alert for very big, fly etc. Customer service has not replied to two of my cases. One for warranty registration and other for tech issue. So looks like they don’t care much after the Sale. Mobile App is very basic. Downloading the video clip from phone is a hit or miss. It errors out most of the time saying “too short duration playback failed”. I am wondering if I made the right decision but this system based on reviews

My seven year old 900TVL 16 camera system from a company that is no longer in business had the hard drive fried by lightning. I had been eyeing this Defender 4k 16 camera system and this gave me an excuse to buy it! I had upgraded the wiring when I installed my old system, so it worked great w/ the Defender 4k system. The cameras are very clear and the night vision is much better than my old system. The zoom feature also works well. Unlike my old system, the system lacks viewing remotely on a PC. I tried viewing remotely from a 7th generation Fire 10 tablet and it worked, but works much better on my 9th generation Fire 10 tablet. Overall, a very nice high quality security system at a bargain price!

I purchased a 1080HD Defender system in 2014 and was happy with it so I upgraded to the 4K Ultra HD security system. Both are wired systems and I found the change over easy and the 4K cameras are a big improvement in the picture. This is in a private residence which has weathered hurricanes and other storms with no effect on the system even during the storm. Would recommend the system.

We purchased a new home with an older model of the Defender Camera system. When we upgraded, we found that there were issues with the DVR we received. We contacted Defender and they replaced the DVR with no problems. They were communicative and kept up up to date on the entire process

This is actually my second Defender security system. I loved my 8 channel 4 camera HD 720p system I bought years ago so much that when I decided it was time to upgrade to newer equipment I knew I trusted Defender and was unsure I would like any other security system so I bit the bullet and got the 4k 16 channel system with 8 cameras. It took me a while to set it up because my old system was still working so I had the luxury of waiting for cooler days to run the cables through my hot attic. I'm very impressed. I knew that the 4k should be clearer and easier to zoom into but when I actually plugged it in I was shocked how much detail I had been missing. The system almost has too many controls. I'm still learning all of the new features. I will say that the outside cameras brightness was set to be to dim at first but thankfully it was an easy adjustment to make them brighter. I assume to is some auto adjustment due to the sun since the indoor cameras default setting looks great. I already know I will have many years of quality use with my new Defender system and I look forward to buying another one in the future.

System is easy to upgrade to. I found out that the old600TVL camera as well as the old wiring worked with the new system. I was also able to download the manual with a different browser.

The screws on the cameras are so tight they cannot be unscrewed. Not even with an electric screwdriver. Not even the strongest man. The camera is useless if I cannot adjust it. I would like to get an exchange for one of the cameras.

Bought refurbished cameras, all work, delivered quickly, great picture day/night, indoors/outdoors. Alerts to my phone, easy to use app, love it, thank you!

As of this moment, because I have one of the four cameras that does not work, I very disappointed. I’ll re-review once the warranty/ replacement occurs

After installing cameras picture quality is really good and I like that I can view cameras on my phone and computer. I also like being able to zoom in on cameras.