We had Ezviz before, it was horrendous, the cameras were very poor at connecting, you could get 1 to connect but adding others caused the app to crash out, the doorbell viewer was ok although the nightvision was very poor as was the same for the cctv cameras, the alarm and door contacts were the only thing that acutally worked as it should, but overall for the money it was a very poor choice, Ring actually worked out cheaper and far better quality and far easier to manage, Just look at the feedback on Eziviz app on google playstore and you will see that they have mounting issues all through the range. we have chosen Hivkvision cctv system now with 8mp cameras hardwired as i could not afford the risk of signal loss via wifi, the ring alarm has god battery and indepedant cellular phone backup in the event of power outage