SONOFF DW2 WIFI Door Window Sensor Open/Closed Detector Smart Home Security Alarm Via eWeLink APP Control With Alexa|Smart Remote Control| - AliExpress
SONOFF DW2 Wi-Fi Wireless Door/Window Sensor - SONOFF Official
SONOFF DW2 Wi-Fi Wireless Door Window Sensor,APP Alert for Home Automation Wireless Alarm Security System, Compatible with IFTTT, No Gateway Required.: Amazon.com: Tools & Home Improvement