Wireless Connection Smart Mini Door Window Sensor Work With Gateway Hub. The Aqara Smart Door Window Sensor Can Detect the Opening and Closing of the Door and Window, then Send a Notification to Your Phone Via the APP. Matching with Other Xiaomi Smart Devices Such As Gateway Remote Control, Smart Bulb, Air Cleaner, Etc. This Sensor Could Help You Create a Smart Control Home. FEATURES: Original Aqara Smart Door and Window Sensor ZigBee Version Wireless Connection Trigger and Alarm: It Will Light and Ring when Someone Open the Door, the Light Will Automatically Turn on when Someone Push the Door Away from Home Mode: If Someone Broke Into, the Bell Will Ring and the IP Camera ( Not Included ) Will Take Video Intelligent Sensors: Open the Window Let Fresh Air into Room Mini Pocket Size, Easy to Install Working Temperature: -10 - 50 Deg Built-in 1pc CR1632 Cell Battery Please Download APP ''Mi Home'' from Apple Store or Google Play . Your order will be shipped from abroad so please allow the necessary time of at least 14 work days for delivery due to ongoing delays in postal deliveries globally.