Wifi Door Window Sensor Detector: Wireless Security Alarm Door Sensor, Tuya Door APP ALERTS ON YOUR PHONE: Wifi door sensor, "Tuya Smart" or "Smart Life" APP control. No hub required and No fees charge. When door/window is opened or closed, the sensor will push instant notification to your smartphone immediately. You can check your house on APP whatever where you are. DOOR ALARM COMPATIBLE WITH ALEXA,GOOGLE HOME: Smart door window alarm works with Alexa and Google Home. Support voice control by Google and Alexa. Alexa/Google is able to answer the question ?Is the door open/closed?? DOOR ALARM COMPATIBLE WITH ALEXA,GOOGLE HOME: Smart door window alarm works with Alexa and Google Home. Support voice control by Google and Alexa. Alexa/Google is able to answer the question ?Is the door open/closed?? LONG-LASTING PERFORMANCE LOW POWER WARNING: Door open alert wireless door sensor powered by 2*AAA batteries(Not included), working time can last for one year without to replace the battery. When the battery is running low, it will automatically push messages through APP to remind you to change battery, never worry about running out of battery. UNIVERSAL COMPATIBILITY QUALITY GUARANTEE: 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. And we will offer you a replacement or refund if you have any problems with your door open alert wireless door sensor.