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The compatible handset for this unit is KX-TGFA51. You can set alarm on your phone system by pressing MENU and then #720. You can access this link for further details: http://help.panasonic.ca/viewing/ALL/KX-TGF540/OI/TGF540_PNQX8346ZA/TGF540_PNQX8346ZA.pdf#page=36
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