Aqara Temperature And Humidity Sensor- 3 Pack, Requires Aqara, Works With Ifttt Product Details ??NOTES?An Aqara Hub is required and sold separately. Requires a secured 2. 4 gigahertz WiFi network connection. The Aqara M2 or M1S Hub can connect up to 128 devices(*use of a repeater such as the Aqara Smart Plug or Aqara Smart Wall Switch(With Neutral) is required). ?REMOTE MONITORING?When the room temperature reaches above or below a certain threshold, the Aqara Temperature and Humidity Sensor can send a push alert to your phone or trigger the Aqara Hub night light. ?HOME AUTOMATION?The Aqara Temperature and Humidity Sensor can control other connected devices such as Aqara Smart Plug to ensure that your fan or humidifier maintains a constant level of comfort for you and your family. ?ACCURATE MEASUREMENT?Utilizes high-quality sensor from the industry-leading manufacturer, Sensirion. ?BUILT-IN AIR PRESSURE SENSOR?Monitors the ambient air pressure in the room. In addition, If you have any questions, please feel free to contact us. 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.