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Wireless Door/Window Sensor
Model SNZB-04 manufactured by Sonoff
Wireless Door/Window Sensor
Supports:
battery
battery low
contact
Available from:
Itead.cc
Aliexpress.com
Banggood.com
Domadoo.fr
Manufacturer:
Itead.cc
Zigbee ID: "DS01"
Confirmed working with
If the device is following Zigbee standards it is possible it will work with other gateway solutions, it is just not confirmed as working yet!

Pairing

Long press reset button for 5s until the LED indicator flashes three times, which means the device has entered pairing mode

Sometimes the battery is not mounted firmly which prevents the device from pairing properly. Adding a washer between the battery holder and the battery or increasing the pressure on the holder fixes this.