- As the buds support Master/Slave switch, both of them can be paired to your phone as a master device. When the right earbud is the master, the Bluetooth name is Liberty 2 Pro, when left earbud is the master the Bluetooth name is Liberty 2 Pro-L. - If you would like to use the left side only, please put the right side in the charging case and close the charging case cover. Select "Liberty 2 Pro-L" to pair.