The Rexing 4.5in Video Baby Monitor is an adequate baby monitor. It has most of what you expect in a baby monitor, though it feels kind of unfinished; like the company said, "hey, let's start making baby monitors. You have a week to research, then we're going into production."
The picture quality is pretty good, advertised as 1080p. I'm not so sure that really matters on a 4 5" screen, though it might make for better quality video if you choose to record footage. I don't really understand how useful the ability to record video is. You must manually hold a button on the handset to record and then the video can only be viewed on a computer. So, if you intended to repurpose the camera as a security device or something you would have to be constantly monitoring the handset to capture the footage you're hoping for. Some sort of movement sensor in the camera would be more helpful, or the ability to set a timer.
The camera can be rotated via the handset, supposedly up to 350 degrees, though I don't believe that is 100% remotely. Just tap and hold a directional arrow for the camera to move in that direction. This process can be a little frustrating. The buttons are not tactile but touch-screen, and the amount of time you have to hold an arrow before movement is just long enough for you to think you didn't have your finger in the right spot, only to let go just as the camera starts to move. Furthermore, these buttons do not have backlighting. So, in the middle of the night if you have to move the camera while looking in on your little one you'll have to turn the lights on. Some low intensity backlighting or a dimple on each arrow would help this immensely.
The camera has the ability to read the temperature of the room, displayed on the handset. Unfortunately, mine does not accurately tell the temperature. It reads 5 to 8 degrees warmer than the room actually is. This poses an issue with the temperature alarm which cannot be adjusted, but luckily can be disabled. You can switch between Fahrenheit or Celsius.
I found it odd that you can switch between Fahrenheit and Celsius but you are stuck using military time. You can adjust the time easily enough, but the time displayed (at least on my unit) is off by 20 minutes.
One other small thing that annoys me about this monitor is the sound control. I would like a little more customization. The volume control is easy enough to operate, though it suffers from the same issues as moving the camera. It must be adjusted using touch-sensitive buttons that are difficult to navigate in the dark. Further frustrating is that the volume control sets the level for every sound. If turned up to hear crying or temperature alerts, then button sounds are also turned up. If you find the button sounds annoying, turning the volume down will also mute the very important alert sounds.
All-in-all, I find this baby monitor to be subpar for the price. At the very basic, the monitor does what it needs to, but in my opinion basic is not enough for this price point. The unit has a lot of features one would ask for, but the quality of many of those features is flawed.