Keywords: ANC031，031，right, left, lower sound, quieter sound, speaker, driver, default, volume
1. Plug/ unplug” the 3.5mm audio jack for several times ( important!)
2. Reset the headphones - ANC031 - Guide - Reset
If the headphones still doesn't work please provide your product "lot number" which print on the headband with CE FCC logo... ( maybe "17xx" or "18xx" ) , product order number to to contact support@avantree.com
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