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Dear Katy, thank you for asking. You can expand your phone system by registering optional handsets (6 max.) to a single base unit. The compatible handsets for your model are: KX-TGDA50 and KX-TGDA51. For the steps regarding the handset registration, please access this link: http://help.panasonic.ca/viewing/ALL/KX-TGD510/OI/TGD510_PNQX8349ZA/TGD510_PNQX8349ZA.pdf#page=25
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