Actiontec Screenbeam USB Transmitter 2 for Win 7/8.

ScreenBeam USB Transmitter 2 (SBT200DI) extends the value of legacy devices and enables wireless display from Windows devices that lack native Miracast support

Windows 7/8 devices with an outdated CPU, Wi-Fi or graphics cards can use this external transmitter to connect legacy laptop, tablet and desktop devices to a ScreenBeam wireless display receiver.