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Door Chime with Phone App,WiFi Door Open Contact Sensor Alarm Chime with 600 FT Range,WiFi Door Ringer Alert for Business/Store/Home/Office When Enter (Three Sensor One Gateway) industrial_best_sellers_Jan2025 No need for a sealerDoor Chime with Phone App,WiFi Door Open Contact Sensor Alarm Chime with 600 FT Range,WiFi Door Ringer Alert for Business Store Home Office When Enter (Three Sensor One Gateway) Product Features <p>WiFi Door Alarms Works Function: This WiFi alarm device can be connected to cell phone with free app for remote push to take care your family anytime and anywhere. When visitors or guests arrive to your home,the Gateway(Plug in Receiver) will sound an