Wifi Door Sensor: Wireless Window Sensor With App Notification Alert, Contact Product Details TUYA DOOR SENSOR: Upgraded door alarm with bluethooth and Wi-Fi dual connecting mode, No gateway hub required; No extra cost; Simple setup wifi window alarms for home in minutes, Control with phone via Smart Life and Tuya apps: available on Android and IOS. Easily install the door sensor anywhere with the included 3M stickers, firm and durable. PHONE ALERTS: Receive Phone Notifications on status change when opened or closed, with an entry save in History Log. Window alarm sensors can be used for Doors, Windows, Cupboards. VOICE CONTROL: Wifi garage sensor compatible with Amazon Alexa and Google Assistant. You can query the opening or closing status of doors/windows by voice. HOME AUTOMATION: Door alarm sensor works with Tuya Smart/Smart Life/Alexa and Routines for Automation. Create routines /scene in Alexa or Smart Life/Tuya app to operate other Smart devices (Smart Bulb, Smart Plug, Siren Alarm, etc). LOW POWER WARNING PEACE OF MIND: The home security system is built-in low consumption module, come with TWO AAA Batteries and provide 1 year monitoring, When the battery level is low, it will automatically push messages throuch App to remind you to change battery, never worry about running out of battery. We provide 24 months warranty on door alarms for home security 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.