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I would say that the little fob things were a bit unreliable, have to press the button a few times until it responds. But the app works well. You can get it to send you push notifications and also an email, and then it calls you as well if you have a sim card in it which connects you to the hub, so you could theoretically have a chat with your burglars. I've used it a few times to freak out my wife when I'm out. Fun times.
Aside, I really like the RFID keypad. I know in this day and age people use phones for everything, but it saves you the faff of having to dig it out of your rucksack/jersey when with bike.
Have a look at ERA Homeguard https://www.safe.co.uk/products/era-homeguard-smart-alarm-pro-superior-kit.html
The advantage it has over all the others is that it will still be able to notify you should your wifi be not working, as it can use a SIM card as backup. My parents were burgled once and the fuckers had cut the phone cable before entering, police said its quite common for burglars to do this. Obv a non point if your phone wire is inaccessible from the outside.
We have two cats and they haven't set of the PIR's, it's a decent bit of kit.