A USB Wi-Fi transmitter works similarly to a router, and connects a computer to the Internet through a USB port. The transmitter is able to lengthen the reach and, in some cases, increase the speed of the Wi-Fi signal from the appliance connected to the router.
There are several types of Wi-Fi USB transmitters available on the market, which range in speeds of less than 11 mbps to speeds of up to 54 mbps. A USB wireless adapter comes with the required software needed to run on a small laptop or computer. Once the software is installed, the adapter will be able to connect to available Wi-Fi signals in the area.