TUYA Door Sensor: Upgraded door alarm with Bluetooth and dual wifi connection mode, no gateway hub needed; no extra cost; simple wifi window alarms for home in minutes, control with phone via Smart Life and Tuya apps: available on Android and iOS. Easily install the door sensor anywhere with included 3M stickers, firm and durable. Phone Alerts: Receive phone notifications about status changes when opening or closing, with an entry recorded in the history log. Window alarm sensors can be used for doors, windows and closets. Voice Control: Wifi garage sensor compatible with Amazon Alexa and Google Assistant. You can query the opening or closing status of doors/windows by voice. Home Automation: The door alarm sensor works with Tuya Smart/Smart Life/Alexa and automation routines. Create routines/scenes in Alexa or Smart Life/Tuya app to operate other smart devices (smart bulb, smart plug, siren alarm, etc.).