Photo 1 of SONOFF SenseGuard DW Gen2 SNZB-04PR2 Zigbee Door Window Contact Sensor, Open/Close Monitoring, Tamper Proof, Phone Alert, Home Security Alarm, Works with Alexa, Home Assistant & SmartThings, 4-Pack

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Photo 1 of SONOFF SenseGuard DW Gen2 SNZB-04PR2 Zigbee Door Window Contact Sensor, Open/Close Monitoring, Tamper Proof, Phone Alert, Home Security Alarm, Works with Alexa, Home Assistant & SmartThings, 4-PackPhoto 2 of SONOFF SenseGuard DW Gen2 SNZB-04PR2 Zigbee Door Window Contact Sensor, Open/Close Monitoring, Tamper Proof, Phone Alert, Home Security Alarm, Works with Alexa, Home Assistant & SmartThings, 4-Pack