Proteus Dx Is A Wifi Door Sensor With An Alert Buzzer And Email/Text Product Details WiFi Door Sensor Detects Door open/ close status and sends alerts by Email/ Text message. Connects to your home or office wifi. No hub or gateway required. No Monthly fees. Easy Setup Sensor switch is hardwired (not wireless) from door to the wifi base unit. 25 ft cable included. Programmable to normally open / normally closed modes. Works with doors, windows, cabinets and more 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.