Welcome to our store！</br>1、When someone illegally opens the door or window (the relative position of the main part and the auxiliary part changes), the alarm can send out a strong alarm and remind the owner. 2、Suitable for homes, apartments, mobile homes, offices, hotel rooms, garages and other places. 3、2.4GHz WiFi one‑key connection simple setting does not require a home gateway, you can easily realize intelligent control of home appliances. 4、Simple operation, 2.4G Hz protocol is more stable, faster and more convenient. 5、Easy to install with adhesive. Can be installed on window or door, can use your phone to remote control. <p class="wang-edit-text"><p class="wang-edit-text"> Item Type: Door Sensor Material: ABS Battery Model: AA LR6x2 (Delivered Without Batteries) Wireless Type: 2.4GHz Wireless Standard: IEEE 802.11b/G/N Working Temperature: 0℃-40℃ Working Humidity: 20%-85% <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 2 x Door Sensor1 x Manual Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>