[WIFI wireless connection] By connecting WIFI and mobile phone connection, whether you are at home or away, Instant notification to your phone immediately when door or window is opened or closed. [Multiple Uses]Install the Alarm Sensor not only on front doors or windows, but also on garage doors, liquor cabinets, front gate, safety deposit box, pet doors and more. [Compatible with Alexa and Google Home] No hub required and No fees charge. Pair our Smartlife app with either Alexa or Google Home and enjoy knowing the status of your door sensor without needing to use your phone. Convenient for you to detect your doors, windows, cabinets, drawers or anywhere you want to notified when it is opened or closed. [Easy Install] No complicated installation tools are required. Please scroll down find the video in the main page how to add sensor to WIFI and Alexa.Low power consumption door sensor, super-long battery life avoid replacement frequently [Product quality and service] Our products are 100% tested and ensure that all products are qualified products before leaving the factory,and provide two-year warranty. Please rest assured to purchase and use.If you have any questions about the alarm system, please contact our customer - service anytime. We will solve it for you and make you satisfaction.