Pros: I owned this DVRs and I think it was a great investment. The installation is easy (at least the part of connecting the cables). I spent hours hiding the cables inside my walls, but that I think is not a fault of the equipment. The cables were long enough for my area and after they were in the wall it was a matter of connecting the cameras to the DVR. It makes a great deal if you intend to monitor a small are which is preferably well lit at night. I had other DVRs and I thin the "motion" recording feature in this one works very well. All I have to do it check the DVR from my computer and search for videos where motion was detected. The android app also works great for live monitoring. I read other customers complaining about difficulties installing a hard disk. I simply added my 1 TB hard disk in it, formatted it and it worked like a charm.

Cons: The only complain I have is in regards to the cameras. When I purchased this DVR I had a very shallow knowledge of surveillance systems. Now, however, I have learned a bit more. The DRV works excellent. The camaras have very low quality, the IR LEDs are not very powerful at might (they barely lighted a door 2 meters away. There are better cameras with more TVLs, better resolution, and most of all a 1/3 sony CCD sensor in them. There are also better cameras with more Infrared LEDs, which are capable of illuminating an object located 10 or 20 meters away. I have to add lens mm is also important. The provided cameras have a 6 mm lens, which is inadequate for small spaces. To fix these I kept only one of the 4 cameras provided, and bough better ones. 3.6 mm, CCD 520 TVL, with 24 LEDs did it for me. But I have to add that considering the value of the DVR, those cameras are basically free. And i would certainly recommend this product.

Pros: I got this cameras on special. They are supposed to be outdoors and so far they have performed (in spite of much rain falling around Miami lately). They provide good color during day time, and of them also provides good quality at might. Although I am illuminating a small area ten feet away. They arrive fast and well packed. I have had one camera installed for about a month, and another one has been in used since last week. I was motivated to write this review because (1) there were no other reviews for the product. (2) see my Cons bellow.

Cons: Unfortunately, one of the cameras has only one IR bulb working. I tried all to get the other ones to work, even installed it by itself in case it was power related), and finally installed it where the other one (like it) is. It should work there, but it does not. So, the other IR LEDs are toasted. The camara works fine during the day, but at night it just gives me a very very dark image. I though of returning it, but considering my previous experiences returning stuff to newegg, the wait time, the price for shipping (among other reasons) I decided to buy an IR iluminator (for about $8). I installed it next (but behind the camara to avoid glare) and I got it to work. This however made me thing that these cameras are either ... how to put it... I mean that perhaps during the manufacturing process not much though were given to quality control, or perhaps I am simply out of luck. I am only hoping for the best in the future, and by that I mean that they actually keep working.

Overall Review: At this point it is hard to recommend this product. Right now an 8 port DVR made by VONNIC is also on sale and I am very hesitant to buy it. But I think I will pass. It has no other reviews and the VONNIC website does not list a manual, download section, or any kind of support (other than the description of the piece).

Pros: Inexpensive, Do have a feeling of well-"builtness" to them.

Cons: No manual. While it might seem that no manual is required, I just got them and have no idea how to use them. I went to manufacturer website and they are a retailer. :/ It's hard to give any star rating to the product.

Pros: Purchased the DVR as a replacement for a previous 4 channel with the idea or reusing cameras and cabling. The old DVR was having trouble recording videos with motion (once motion was detected I would be missing 30 seconds of it). The vonnic DVR does not have any of these problems. I set it to record only motioned detected videos and it saves a lot of hdd space (that is versus recording 24 hrs). The quality of all channels in D1 is fine, as well as the phone monitoring. I like the ftp option as other dvrs I have worked with are only capable of sending a picture via email. Vonnic uploads a video to an ftp server. DDNS is also useful. The PC based monitoring software is a bit awkward, but after a few usages it becomes a little more user friendly. I also like the NTP server (it goes online and pulls the time from internet).

Cons: The DVR came with a defective power supply. I figured it put after trying the power supply from the old DVR I was replacing. The defect was visible in the image. The power supply would turn on the machine and spin the hard disk, but the hard disk would give random write errors, and the image had a lot of noise (horizontal lines running up and down). I contacted vonnic from the link on their site, and they are shipping a new power supply (on the same day). I also contacted them before to ask questions related to new firmwares and support option. They replied very quickly and updated their website. 5 eggs to VONNIC for their support. After all, what good is a product without good support. ;)

Overall Review: I would recommend this 4 ch dvr to anyone.