WF40 Wi-Fi USB Dongle. The WF40 Wi-Fi USB Dongle enables the SIP-T48G to be connected to wireless networks. Supports Yealink SIP-T48G (upgrade to the version of 35.80.0.95 or higher). Supports Yealink VERISON SIP-T48G (upgrade to the version of 35.80.0.95 or higher).
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