I've been having this camera on our construction site for a few months now.
Battery - stayed at 100% since then with the help of solar panels.
Nightvision - clear without almost no light in my area. Built-in light can be useful too.
Mic - The 2-way audio works quite loud (much louder than a speakerphone on a mobile).
Data usage: I got a 30GB plan for 90 days. With daily camera viewing several times a day it hasn't used even 1GB yet. I think more power could be used if we use the built-in light and record many videos. For live viewing, data usage is very minimal.

I wouldn't recommend if you want to move this into a WiFi network later, as this works only with a SIM card.

Got this as a gift and thought it was classy looking. Good resolution and easy to use. I think if the site offers more discount, this camera purchase would have been ideal. It is much better quality than the low cost one out there.

Will be great to have more build in software features. However, we can always export and do that.

Very useful, comfortable and functional, used on site and serves its purpose!

4G cameras usually do not hold signal, NOT this one. NOT a cheap plastic camera toy, it is an important part of a security plan without wifi. The mounting bracket and solar panel and battery life are excellent. Very easy to set up. Don't buy a cheaper version, this one has great PTZ. Good sound quality. The app is reliable and free. A small annual fee gets you cloud service for a year. I am just getting the second one up and running.

So I am more than convinced of this camera. Top quality at an absolutely fair price. Night vision works just as well as day vision. You can make a lot of settings. Incl. 2-way voice output. The cracker. The 4G connection is absolutely great. The all round visibility excellent. So all in all I can only recommend this camera. And the support (if you ever have a question) is excellent. You will get an answer within a day. Thank you Eric I call that service.

The x digital zoom on this 4g camera is impressive. Capture every detail and never miss a thing, whether it's day or night.

K&F Concept 3G/4G camera:
Fantastic picture during the day and at night with white LED or IR. In addition, the camera can actually do without an internet or power connection. Smooth operation when watching the videos. Detected movements are communicated via push.
The software still has room for improvement

It works perfectly, mounts without a problem and looks pretty well built. On a well-known auction site they ask twice as much... For me, 100% recommended.
In order to use it, you have to program the camera so that it can shoot without a lens (I have a Fujifilm X-E3); otherwise the camera does not detect the target and does not shoot. This can be adjusted in one of the camera menus.