Meross Smart Wifi Door Window Sensor Kit, Support Apple Homekit, Alexa, Product Features [Safe Efficient Use] Keep your home safe and secure with our advanced smart wifi door sensor, compatible with Apple HomeKit, Alexa, and SmartThings. No Tools are Needed, simply use the included strong mounting tape to install. Up to 0.94 in wide gap allowed for the two sensors. ???NOTES?Need a 2.4GHz Wi-Fi and connect to Meross hub first. Hub and sub-sensors are recommended installed close to 10m or less for a stable signal. [Real-time Alert Notification] Get alerts immediately on your Meross app - giving you peace of mind and taking action quickly if needed. [Home Devices Automation] Take your home automation to the next level with Meross HomeKit Door Sensor, easily set triggers to control other HomeKit devices. Expand your smart home ecosystem, make your life easier and more convenient. [Hands-Free Voice Control] Enjoy the convenience of hands-free access. Simply ask your device to check the status of your door alarm sensor - no need to go downstairs or pick up your phone again. You'll always know whether your door is opening or closing. [Superb Versatility] One hub can control up to 16 Meross sensors. Low-power consumption of sensor(18+ months battery life). Free history record and export historical data at any time for security checking. [Multiple Uses] Conveniently check your bedroom door, bedroom windows, kids room, fridge, cat door, cabinet or anywhere you want to be notified. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!