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Aqara Wireless Remote Switch (Single Rocker) (2016 version)
Model WXKG03LM manufactured by Xiaomi
Aqara Wireless Remote Switch (Single Rocker) (2016 version)
Supports:
battery percentage
single click
Available from:
Aliexpress.com
Amazon.de
Manufacturer:
Aqara.com
Zigbee ID: "lumi.sensor_86sw1"
Confirmed working with

Pairing Instructions
Press and hold the button on the device until the blue light starts blinking, release it and the pairing should begin.

If you're having connection or pairing issues read Xiaomi & Aqara Devices - Pairing & Keeping them connected.