The alarm works perfectly and does its job exceptionally well. It is easy to program. Its siren on (HIGH-setting via the app) is very loud. Highly recommended.

It constantly connects and disconnects. Also, it does not connect extra chuango accessories. I suggest investing in something more professional.

The truth is that no matter how much I read and searched, it doesn't connect to the internet as easily as advertised for an 80-meter range. If it's in an open space, maybe it works, but if there are rooms, walls, etc., it has a big problem with the signal. Some sensors, even though you have set them to only activate when the alarm is armed, due to a mistake in the application, they detect a different setting and end up triggering when you open the door, even if the alarm is not armed, which can be very frustrating. With all these problems, it's not worth it

I was thrilled!
I bought this device (55€), along with the WS-280 siren (45€), the PIR-910 motion sensor (24.4€), and three additional DWC-102 sensors (12.2€ each), and with 160€ I set up a complete alarm system.
The additional peripherals connect easily on the first try and work perfectly with the central unit OV-300.
The only downside is that it could have included an extra remote control in the package (unfortunately, not all elderly people are familiar with Android Apps).
Fortunately, one can purchase them separately.

Owner of the previous G5 alarm system, which uses a SIM card and the cost increases significantly, I decided to get this one that uses WiFi. It is good and easy to connect, and it works with the previous wireless sensors. It also has an app where you can adjust everything. The only downside is that it doesn't call you, but you hear a message sound. It should have better and more noticeable notification on the phone when a violation occurs. That's the only negative thing I can find. Otherwise, it is very good.

VFM. Reliable alarm, perfect for its cost. The sensors work great. It is easily programmable and you can be sure that it is armed, as you have set it. Recommended.

Small but miraculous for basic home security. When I first installed it, I was discouraged by the intensity of the siren, but after about a week, I discovered (advanced settings) that it also has a high intensity that disturbs people. The dreamcatcher application is quite good with many settings and easy installation, and of course notifications. I also got an imitation control which I programmed with the original one and it works fine. The only mistake I made was with the door sensor, which I stuck with the provided 3m tape and at some point it came off, causing it to fall and break. So if you get it, it's better to screw it onto the casing using the holes it has.