Product Features: 1. Instant Notification: Push instant notification to your phone immediately when door or window is opened or closed. Keeping you informed all the time.2. Alarm Alert: Whenever the sensor is triggered to open/close, it send alarm to alert you that someone opens your door or window.3. Alarm Recording: Support checking open / close records and battery level on the app. Never worry about missing any important moments or running out of battery.4. Device Share: Select "Home Management" in the "Me" page to share your added sensors with family members. so that they can also monitor the status of doors/.5. Low Voltage Remind: When battery level is low, it automatically remind you to change batteries, never worry about running out of battery.6. Works with and Assistant.Colour: BlackMaterial: ABSPackage Contents:1 x Main Body1 x Small Body1 x glue1 x English User ManuaOnly 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 +/ 13cm.