Wifi Door Sensor, Tuya Smart Door Window Sensor, Smart Window Sensor, 1 Pack Product Details Receive Real-time Alarms Remotely: when the door/window is opened or closed, the sensor will push instant notification to your smartphone immediately Alert message push: When the door/window is triggered, you will receive an alarm signal from your phone. Convenient for you to detect your doors, windows, cabinets, drawers, or anywhere you want to notified when it is opened or closed Only work with 2. 4 GHz WIFI CONNECTION: It connects to your smartphone via App under 2.4G Wi-Fi environment. If your WiFi router only supports 5G, the device won?t connect Compatible with Alexa and Google home: It can also perform auto control together with other smart devices that are compatible with Smart life. The sensor door needs two AA batteries(not include). When the battery level is low, it will automatically push messages through APP to remind you to change the battery, never worry about running out of battery Easy Installation?No Need to use complicated tools when installation, just use 3M glue to install, firm and durable. The distance between the two components should be as close as possible, and the closest distance should not affect the opening/closing of the door or window Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.