Add Switchbot Hub Mini To Make It Alexa-Compatible. Switchbot Smart Motion Door Product Details [Motion Sensor Detects Your Movements] With a motion detection range of up to almost 30 feet within 110 horizontally and 55 vertically, there?s more than enough range to secure an entire room of your home. You?re also able to customize the sensitivity settings so that you are only alerted to movements that matter to you. With the built-in light sensor, it will automatically trigger the SwitchBot Bot to turn on the light if someone moves when the environment gets dark. [Easy to Install Long Battery Life] Thanks to its small and wireless design, SwitchBot Motion Sensor can be installed and set up in seconds. You can place it anywhere since its magnetic flexible base can be inserted to the bottom and side. The included battery provides up to 3 years of power for round-the-clock security. [Part of SwitchBot Ecosystem Compatible with Alexa] Connect Motion Sensor with other SwitchBot products and set up a ?Scene? in the SwitchBot app. When you come home, SwitchBot Bot (button pusher) will automatically be triggered to turn on the light, and Alexa will say ?welcome home?. When you leave, SwitchBot Indoor Camera will automatically turn on to detect indoor activity while you?re away (SwitchBot Hub Mini required) [Remote Alert Notification] You will receive a notification if a suspicious person enters the house while you are away. [Energy Money Saving] By detecting the room vacant, Motion Sensor automatically turns off the lights, reducing unnecessary energy consumption to save you money. 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.