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My base unit has a +/- volume button right smack in the middle of it. You can't miss it. If it's not there you must have a different model.
Sorry, there was a problem. Please try again later.Dear customer, thank you for your question. Please see the answer by accessing the link below: http://help.panasonic.ca/viewing/ALL/KX-TG3760/OI/TGD562_PNQX8351YA/TGD562_PNQX8351YA.pdf#page=54
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