Compatible with Alexa & Google Home: Simply use your voice to control the connected devices by Alexa or Google Home. It can also perform auto control together with other smart devices which are compatible with Smart Life . Convenient for you to detect your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. Enjoy Your Smart Life: When you leave home, it will push notification message to you when the door/window opens or closes, so you can discover the intruder in time. Furthermore, you could share the device to your family members and track the history of sensor activities. Easy to Install: No complicated installation tools are required. The sensor can be installed with double-sided adhesive tape or screws(included) in just a few steps, and download an app ldquoSmart Liferdquofrom GooglePlay or App Store to add the device to detect the status of your door/window. Specification: Battery: AAA1.5V x 2 (Batteries not included) Standby current: le5uA Protocol: IEEE 802.11b/g/n Operating Temperature: -10 Celsius-40 Celsius (14degF-104degF) Operating Humidity: 20%-85% Storage Temperature: -10 Celsius -60 Celsius (14degF-140degF) Storage Humidity: 0%-90% Standby time : 6 - 12 months Range: 45m Wireless Type : 2.4GHz Size:Main body : 93mm x40mm x20 mm Small body : 93mm x 13mm x 20 mm