Wi-Fi USB Dongle WF40 is a low-power, small form factor device that can be implemented within offices for seamlessly connecting their IP phones to available wireless networks. This dynamic plug-and-play style USB device is an ideal office networking solution for companies—particularly, smaller organizations—seeking affordable, convenient and reliable high-speed wireless connectivity. Features > Supports Yealink SIP-T29G/T46G/T48G/T46S/T48S - For T48G: upgrade to the version of 35.80.0.95 or higher - For T29G/T46G/T46S/T48S: upgrade to the version 81 or higher > Reliable Connection > Ease-of-use > Plug and Play > High Transmission Rate > Lower Power Consumption