Features:1. Real-Time Door Status Monitoring – Check whether your door is open or closed directly from your phone.2. Unlock Record Tracking – Keep a clear log of every door unlock event to know who accessed it and when.3. Automatic Lock Support – Works with compatible smart lock systems that feature auto-lock function for enhanced convenience.4. Easy Installation – Compact ABS design for quick setup without wiring.5. Reliable Detection – Detects open/close status with a detection distance of less than 22mm.Product Details:This wireless door sensor is designed to pair seamlessly with compatible smart lock systems. It detects open/close status in real time and logs each unlock event, providing full visibility and control over door access. Made from durable ABS, it is compact and easy to install, adding an extra layer of security and convenience to your smart home setup.Specifications:- Power Supply: CR2032 Battery (not included)- Working Voltage: 3V- Standby Current: < 5µA- Detection Distance: < 22mm- Compatible Devices: All smart lock systems that support adding a door sensor in the app settings- Note: This sensor cannot be used alone; it must be paired with a compatible smart lock system.- Color: White- Material: ABS- Size: 41 × 27 × 11.5 mm; 41 × 10 × 11.5 mm- Package Includes: 4 × Sensor, 4 × Receiver