FREE APP ALERTS FOR PEACE OF MIND: No hub required; The window door contact sensor is controlled by Tuya Smart App or Smart Life App. An alert notification automatic send to you once the sensor triggered; A must have security system accessories VOICE CONTROL: The Smart door sensor is compatible with Alexa and Assistant, Simply give a voice to check if your door is open or close, such as "Alexa , is the front door open?" SMART HOME AUTOMATION: You can set a condition in the smart scene, Automatically turn on your smart wall switches or lights when door opened; or the air conditioner in your room is turned off once your window is open. More smart devices can be sync as long as they compatible with Smart Life app. SMART SECURITY SENSOR: All alarm record history can be check in app; All the statuses of doors and be displayed simultaneously in the app; Share the device to your families, they can check the status and get notified at the same time APP remote control is connected to the app via WIFI without a hub.After the connection, the user can monitor the status of and anytime, anywhere. Colour:White Material:ABS Note the features: 1. [APP remote control] Remotely set the arm and disarm at any time through the mobile phone APP 2. [One-click arming] You can set one-click arming, which is more convenient to use. 3. [Voice control] Used with Alexa and Home, you can check whether and are open or closed 4. [Sharing function] Share with family members and control together 5. [Offline function] When the device is offline, the APP remind the device to be offline after 30 minutes 6. [Low battery reminder function] The product uses 2 AAA batteries (not included). When the battery is low, the phone remind you to replace the battery [Product parameters]: 1. Battery: 2*AAA Battery(not included) 2. Working temperature: -10-50 3. Wireless network type: 2.4GHZ 802.11b/g 4. Application: smart life 5. Product size: 70x20x25mm Package Contents: 1 * Smart Magnetic Door Sensor Only 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 +/- 1-3cm.