Press the Pair button on one of the controllers in the group (Master). This controller’s LED will blink green.
Press the Pair button on new controller being added to the group (Slave). Its LED will blink green, and the first controller’s LED will blink red/green.
Press the Pair button on the first controller (Master) again to complete the grouping operation. The controller's LED will flash green three times to confirm the group setting was saved.
Only controllers with no previously saved group or pairing can join a group. If you need to reset your controller because it was previously assigned to a group, visit the How to factory reset a Levven power controller? knowledgebase article.

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