Wifi Door Sensor: Smart Window Contact Sensor, App Alerts, Programmable, 1 Pack Product Details SMART SECURITY SENSOR WITHE FREE APP ALERTS: Wifi door window sensor, Controlled by "Tuya smart" or "Smart life" app; when door/window is opened or closed, the sensor will push instant notification to your smartphone. Door status, All alarm record history and battery power can be check in app. In addition, share the device to your families, they can check the status and get notified at the same time. NEWLY UPGRADED TUYA DOOR SENSOR: Newly upgraded version is bluethooth + Wifi dual connecting mode, do upgraded for helping faster and better paring device to the App, No hub required; Simple setup! Wifi garage sensor compatible with Amazon Alexa and Google Assistant. PROGRAMMABLE SENSOR: Extend your smart home automation with wifi window sensor; Set up your smart routines in app; For example, Automatically turn on your smart wall switches or lights when door opened;More smart devices can be sync as long as they compatible with Tuya/Smart Life app. EASY INSTALLATION MULTIPLE USES: Without tools, easily setup wifi window alarms for home in minutes, just use 3M glue to install, firm and durable. You can install the alexa door sensor not only on front doors or windows, but also on garage doors, liquor cabinets, safety deposit box, pet doors and more. The contact sensor is also a good option for use as a mailbox sensor. PEACE OF MIND: The smart window sensor is built-in low consumption module, 2*AAA Alkaline battery provide 1.5 year monitoring; When the battery level is low, it will send App notification to remind you to change battery, never worry about running out of battery. 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.