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Nest Secure Alarm System Starter Pack (H1500ES):
$19.99
Nest Secure Alarm System Starter Pack is an alarm system kit. The kit includes a Nest Guard security hub and three Nest Detect sensors to monitor doors and windows, along with two fobs. The system cannot be controlled through the Nest app and can be expanded with additional sensors and devices. Comes with a pack of replacement adhesive tabs.
This system was working properly after Google stopped support. I do not know if you can still use the app to set the equipment up, if so this is a great system for super cheap.