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Used to detects smoke and issues an alarm to alert nearby people that there is a potential fire. WhatsApp me if you interested https://m.doubleprotech.com/index.php?ws=showproducts&products_id=3886433

-provides extra protection forthose areas inside your premise where an intruder might  pass through.(e.g.hallways, doorways,stairways, etc.) ... WhatsApp me if you interested https://m.doubleprotech.com/index.php?ws=showproducts&products_id=3886505

-used when detecting movement across larger areas. -movement is detected by something crossing the beam created between the units (transmit ... WhatsApp me if you interested https://m.doubleprotech.com/index.php?ws=showproducts&products_id=3886511