1、Convenient for you to detect your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. 2、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. 3、You could share the device to your family members and see the history of sensor activities. 4、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 \"tuya\" or \"Smart Life\" from GooglePlay or App Store to add the device to detect the status of your door/window. 5、Protect your home and families. 6、When power is low, the sensor will push messages to remind user to replace batteries in time. Simply use your voice to control the connected devices by Alexa or Home. It can also perform auto control together with other intelligent devices which are compatible with Smart Life. Features: Convenient for you to detect your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. 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. You could share the device to your family members and see the history of sensor activities. 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 "tuya" or "Smart Life" from GooglePlay or App Store to add the device to detect the status of your door/window. Protect your home and families. When power is low, the sensor will push messages to remind user to replace batteries in time. Specifications: Main color: white Main material: ABS Transmission distance: 50-200m (in open area) Shock resistence: 4.7M, 1.2M, 3.5M, 300k Battery: 2 * AAA battery (not included) Package size: 90 * 50 * 25mm / 3.5 * 2.0 * 1.0in Package weight: 53g / 1.9ounce Packing List: 1 * Set of Door Sensor 1 * User Manual 1 * Set of Door Sensor 1 * User Manual