Door Sensor for Home Alarm System Host, DIY Expandable Part Key Benefits Instant smartphone alerts via Tuya and Smart Life apps when a sensor is triggered or motion is detected. Stay informed in real time whether you are at home or away. No contract or recurring monitoring fees. Own the system outright with no hidden charges. and expandable setup lets you protect doors, windows, or specific rooms now and add more sensors, cameras, or devices later as needs change. One click SOS function delivers a fast distress signal to preconfigured contacts or an emergency response center for rapid assistance. Simple DIY installation and operation so all household members, including older adults and children, can use it quickly. What it does Detects openings and sensor triggers, and reports events to your smartphone through Tuya and Smart Life apps. Sends one click SOS alerts to preset contacts or a designated emergency center. Integrates with a compatible home alarm system host as a plug in expandable part to build a tailored security setup. Compatibility and performance Designed to work with alarm system hosts that support Tuya and Smart Life app integration. Check your host compatibility before installation. Ideal as an add on sensor in a modular, DIY alarm system where expandability and app based control are required. Reliable notifications and fast alarm signaling to help you respond quickly to incidents. Ease of use and installation No complex wiring or professional setup required. Can be installed in key areas of the home with basic mounting. Straightforward setup and app pairing allow rapid commissioning. Easy operation suitable for family members with varying technical experience. Practical use scenarios Front door monitoring: Receive immediate alerts when the front door is opened while you are out, and arm the system during nights or vacations. Window or room protection: Install on ground floor windows or specific rooms to detect unauthorized entry and extend visibility across vulnerable areas. Care and safety support: Place near the primary entrance or a main living area so a quick SOS alert can notify family members or neighbors if immediate help is needed. What to expect in the box and next steps This item is a DIY expandable sensor part intended to work with a compatible home alarm system host and Tuya or Smart Life app control. Confirm host compatibility before . Expand the system over time by adding additional sensors, cameras, or accessories that support the same platform. This door sensor delivers real time alerts, simple installation, and expandable home protection without recurring monitoring fees, making it a practical component for customized home security setups.