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Swann Window and Door Sensor (Single Pack) SWO-WDS1PA B&H Photo
Swann Wireless Window/Door Alert Sensor (2 Pack). Easy Installation (Permanent or Temporary), Wi-Fi Connected, Battery Powered, No Hub Required, Alerts to Your Smartphone and Control Sensor Using App - Amazon.com
Swann Home Alert Wi-Fi Smart Wireless Window Door, Motion, and Indoor Siren Alarm Kit (5-Pack) SWIFI-ALARMKITA - The Home Depot
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Amazon.com: Swann Wireless Window/Door Alert Sensor. Easy Installation (Permanent or Temporary), Wi-Fi Connected, Battery Powered, No Hub Required, Get Alerts to Your Smartphone and Control Sensor Using The App : Electronics