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Remote Controller
Model CTR.U manufactured by Airam
Remote Controller
Supports:
brightness up/down
click/hold/release
on/off
Available from:
Sahkonumerot.fi
Manufacturer:
Airam.fi
Zigbee ID: "ZBT-Remote-EU-DIMV1A2"
Confirmed working with

Pairing

Hold small reset button pressed (located under battery cover on the backside of remote) for 4 seconds and device will reset and will attempt to join network. Keep clicking any button on the frontside of the device to keep device awake while pairing. You should be clicking every two seconds until pairing is complete.

Device seems to join network also when it is paired directly to Airam bulb (which is joined to network already) (https://www.zigbee2mqtt.io/devices/4713407.html) by keeping ON and DIM buttons pressed while holding remote within 5 centimeters away from Airam bulb.