Features: Safeguards your home with this wireless door alarm accessory, designed for easy integration with your existing doorbell system. Effortlessly install and operate this magnetic transmitter, powered by a long lasting battery and featuring adhesive for easy mounting. Perfect for homeowners and office workers looking to expand their current doorbell setups, providing reliable detection and alerting capabilities. Suitable for various settings including homes, shops, offices, hotels, and counters, ensuring prompt notification when doors or windows are opened. Enjoy the convenience of a wide operating ranges, allowing you to monitors entrances and exits throughout your space. Specifications: Material: plastic Size: approx 5.4x2.7x1.4cm/2x1x0.6inch Staticcurrent: less than 8uA Launchs distance: 120m(open distance) Operating distance: 25-36mm Low voltage alarm: 2.2-2.4V Transmission frequency: 433MHz Operating temperature: -10-50℃ Installation method: double-sided adhesive tape Package Includes: 1xDoor Alarm Sensor note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item.