1. [APP remote control] Remotely set up and disarm at any time through the mobile APP 2. [One-click arming] You can set one-click arming, which is more convenient to use. 3. [Voice Control] Used in conjunction with and Home, you can check whether doors and windows are open or closed 4. [Sharing function] Share with family members and control together 5. [Offline function] When the device is offline, the APP will remind the device to go offline after 30 minutes. [Low battery reminder function] The product uses 2 AAA batteries (not included). When the battery power is low, the phone will remind you to replace the battery. [Easy to Install] Just stick one piece to your door or window, then use double-sided tape to stick the other piece to the door or window frame, just a few steps Battery:2xAAA Battery(not included) Working temperature:-10-50 Wireless network type:2.4GHZ 802.11b/g Application:Smart Life Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:White Material:plastic Package Contents: 1 * ZigBee Door Window Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.