I’m not sure what you have available over there, but this equates to about $18-20 US, while I see an market for lower cost devices, Here in the US you can get Packs of Iris sensors for ~$26 consisting of 2 contact/temp, 1 motion/temp, 1 button, 1 plug Or Less if you follow the Deals Thread. These connect to ST automatically. This is just one example, there are others.
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