Chunhee Wifi Door Sensor, Door Sensor Alarms Detector Real-Time, 2.4Ghz Wifi Product Features ? Smart WiFi Door Sensor with APP Alerts: Control with the "Tuya Smart" or "Smart Life" app. Get instant app free notification alerts on your smartphone when doors or windows open or close. Please choose 2.4GHz WiFi, not support 5G WiFi. App notifications are free, if you choose SMS or phone notifications may need to pay. ?? Supports Voice Control: Door alarms for home compatible with Amazon Alexa and Google Assistant. Simply ask, "Alexa, is the 'Device Name' Closed/Opened?" If you face any connectivity issues, reach out to us for a quick solution. ? 90dB Sound or Silence: With a double-click, adjust the volume of the 90dB door sensor chime to your liking, or simply turn off the sound altogether. You'll still receive alerts from the app regardless, making this wireless door alarm the perfect balance of convenience and customization. ? Batteries Included: The sensor door alarms are equipped with 2 AAA Batteries. Enjoy over one year of battery life with this door alarm sensor, avoids frequent replacement. ? Easy Installation and Widely Use: Install the door sensor with the included 3M sticker for a firm and durable hold. Place it on gates, refrigerators, drawers, bedrooms, garages, yards, pet doors, and more. You can refer to the video installation in the main image. ?Lifetime Warranty Service: No matter how long you have purchased, please feel free to contact us if you encounter any problems, and we will solve them for you within 24 hours. 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!