Unihoms Upgraded Window/Door Sensor No gateway hub required, No extra cost, Simple setup wifi window alarms for home in minutes, Control with phone via Unihoms apps: available on Android and IOS

Easily install the door sensor anywhere in your home.

When you leave home, it will push a 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 with your family members and track the history of sensor activities.

Window alarm sensors can be used for Doors, Windows, and Cupboards.

Compatible with Amazon Alexa and Google Assistant. You can query the opening or closing status of doors/windows by voice.
The home security system is a built-in low-consumption module, comes with TWO AAA Batteries and provides 1 year of monitoring, When the battery level is low, it will automatically push messages through the App to remind you to change the battery, so never worry about running out of battery.