Smart Door Sensor 2 Pack, TESSAN WiFi Window Contact Sensor Work with Amazon Alexa, Google Assistant, No Hub Required…

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Smart Security Sensor: TESSAN door and window alarm sensor is designed to monitor the open or close status of any entrance; An alert notification will automatic send to you in 10 seconds once the sensor triggered; Ideal for front door, window, baby room, garage and more; Door status and battery power can be check in app; No hub required; No extra cost; A must have security system accessories
Programmable Sensor: Extend your smart home automation with TESSAN wifi door sensor; Set up your smart routines in app; Automatically turn on your smart wall switches or lights when door opened; Automatically turn off your air-condition when window opened; More smart devices can be sync as long as they compatible with Smart Life app; Support 2.4Ghz Wifi only, dual-band (2.4G and 5G) WiFf need to set a separate 2.4G channel