The motion and door/window sensors can be mounted with screws or with Velcro strips (provided). I’m happy the sensors didn’t come from the factory with the strips already attached. I’ve never seen an adhesive strip that didn’t eventually fail, so I prefer to use screws—and peeling those strips off so you can use screws is a major pain. The sensor batteries come preinstalled, so you just pull out a plastic tab when the app tells you to. This enables the battery to touch the electrical contact inside the sensor, powering it up.
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