Swann Leak Alert Sensor. Easy Installation (Permanent or Temporary), Wi-Fi Connected, Battery Powered, No Hub Required, Alerts to Your Smartphone and Get Early Warning of Leaking Pipes or Appliances - Amazon.com
Swann Compact Window and Door Magnetic Alarm Sensor, 110DB+ #SW351-MDA - SEALED! | eBay
SWANN announce new Buddy Video Doorbell and Smart Alert Sensor range » EFTM
Swann Home Alert Wi-Fi Smart Wireless Window Door Sensor Alarm Kit (4-Pack) SWIFI-WDOORPK4 - The Home Depot