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We added this set to an existing set we had.
Sorry, there was a problem. Please try again later.Hi! Yes definitely, you can extend the unit up to 6 handsets. The compatible model to purchase separately will be KX-TGEA60. If you purchase 2 systems KX-TGE633, they can work together, however the handsets will have to be deregistered and registered to one base, if you want to ''extend'' your system, otherwise, you can have 2 systems but make sure to disable the answering machine on one, just in case there is interference. -A
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