Welcome to our store! 1. Notification Push: When you leave home, if the door or window is opened or intruded upon, you'll receive a notification, immediately alerting you to any unusual activity. 2. Sleek Design: Small and compact, with a well-proportioned design and optimized internal structure for comfort, beauty, and ease of use. 3. Smart Linking Scenario: When unoccupied, potential security risks like break-ins or gas leaks can't be ignored. Activate smart home mode for comprehensive detection of unusual conditions and protect your family and property. 4. Home Lighting Mode: Upon entering your home at night, the living room lights automatically turn on and the curtains close. No more fumbling for switches! 5. Multi-Scenario Application: Suitable for homes, shops, offices, factories, and more. Made of high-quality ABS material, durable for indoor and outdoor use. Item Type: Smart Door and Window Sensor Material: ABS Product Size: Approx. 4 x 2.5 x 1.2 cm / 1.6 x 1.0 x 0.5 inches, 2.6 x 1 x 0.9 cm / 1 x 0.4 x 0.3 inches Weight: Approx. 35 g / 1.2 oz Operating Temperature: -10℃ to 50 ℃ Operating Humidity: 0% to 95%RH (non-condensing) Battery: CR2032 button battery 150mah (included) Includes: 1 x Alarm 1 x Sensor 1 x Manual 1 x Needle Satisfaction Guarantee: Customers are our top priority. If you encounter any issues, please contact the seller immediately. We strive to provide excellent customer service.