Ring Alarm System sells on Amazon. I think the price is very good. Please read some of the reviews and see what people thought of the product. Do check how you might qualify for a free shipping offer if available.

  • System comes with a Base Station, Contact Sensor, Motion Detector, Keypad and Range Extender
  • Sends alerts to iOS and Android devices when doors or windows open and when motion is detected
  • No tools or professional installation required: Comes with everything you need to set it up in minutes
  • No long-term contracts: Get optional 24/7 professional monitoring with cellular backup and more for only $15 a month
  • Add extra sensors to expand your system, and connect it to all your Ring devices to control your home security from one app
  • Includes a built-in 24-hour backup battery and 104-decibel siren
  • Advanced motion sensitivity: Won’t detect pets weighing under 50 lbs when mounted above seven feet
  • This device does not currently ship to Quebec, Canada.

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