As per the title.
This little device can be used to extend an existing wireless connection or be used as a wireless bridge (e.g. xbox 360 or existing pc without a wireless card).
It can also be used as an access point for an existing router that isn't wireless.
All in all quite a functional device for £25.98.
You can get free delivery if you're a member of the avforums.
Edimax EW-7206APG Wireless Access Point 802.11g, 54Mbps with WDS Function & Repeater (Extender)
IEEE 802.11g/b Wireless LAN Access Point
Acting as a bridge between the wired Ethernet and the 2.4GHz IEEE 802.11g/b wireless LAN, this wireless LAN access point can let your wireless LAN client stations access both the wired and the wireless network nodes.
Universal Repeater/Extender Mode
The Universal Repeater function can extend the coverage and signal strength for the current wireless environment. It is compatible with other wireless APs and Routers. Users can use this feature to build up a large wireless network in a huge space like airports, hotels and schoolsetc.
Station Mode (AP Client Mode)
You can connect EW-7206APg to a network device's Ethernet port and enable Station mode. It turn easily this wired network device to a wireless one without changing any configuration.
Robust Wireless Security
Beside the basic security control by ESSID and 64/128 bit key length WEP encryption, this access point also supports the advanced security features, like MAC access control, IEEE 802.1x authentication, TKIP, AES and hidden ESSID. It provides a total solution for you to build up a secure wireless network environment that can prevent from hacker intrusion.
RP-SMA Detachable Antenna
This access point provides a standard RP-SMA antenna connector that can let you apply all kinds of high gain antennas. This can help you enlarge your wireless LAN coverage.
You can configure this access point through the friendly Web user interface with a browser.