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There is no jack on any of the three. It is designed to work wirelessly through Bluetooth with the base unit.
Sorry, there was a problem. Please try again later.All the handsets have a headphone jack except the base unit. They have a 2,5 mm aux jack compatible with Panasonic headsets( KX series). You may use them with an adapter from 2,5 to an universal 3,5 mm.
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