I bought this system a few years ago from Cruzpro in New Zealand.
Its low cost, easy to install when directions are followed and very reliable.
When initially installing I had false alarms ever thunder storm. Bert at Cruzpro was very helpful with prompt replies and problem solved.
Recently The power was interrupted erratically to the system and I could not get it to function so assumed I had damaged the unit.
I emailed Bert, received a prompt reply with a couple of ways to fix, now all good again.
This to me is exceptional ongoing customer service.