Optional connections for UH34: USB-C, 3.5mm jack. -UH34 Lite with foamy ear cushions. - USB connectivity to Yealink IP phones, including T41S/T42S/T46S/T48S/T42U/T43U/T46U/T48U/T53/T53W/T54W/T57W/T58A/VP59 (T41S/T42S/T46S/T48S should be upgraded to version 82 or higher).
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