Welcome to our store！</br>1、The sensor is very convenient to use, just stick it on any place where two objects are connected, even if you don't take care of it, it is always safe. 2、The wireless door and window sensor can be installed on your door or window. If your door or window is open or closed, it will notify you through an alarm, adding an extra layer of security to your home. 3、Sensor records can be synchronized to your and family's mobile phones and shared with your family, so that they can quickly control and monitor your home's history check together. 4、Installation is simple, setting is easier, and the adhesive (included) installation can save you time. 5、It's application can also be extended to a wide range of fields such as drawers, garage doors, and shutters. <p class="wang-edit-text"><p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> <p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: Smart door anti-theft sensor Material: ABS Battery: 3V CR123A (without battery) USB Power Supply: DC5V /1A Working Temperature: 0-40℃ Wireless Frequency: 2.4GHZ Communication Protocol: Zigbee 3.0 Wireless Standard: IEEE802.11B/Q/N Wireless Range: Approx. 40 meters/ 131.2ft <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 Sensor 1 x Manual&nbsp; 1 x USB Cable 2 x Sticker 4 x Screw 4 x Expansion Tube 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>