I ordered from snapdeal.com.
it comes with a installation CD and is small dongle which is used as a wifi hotspot or a WiFi access point.The speed which is given on the box was 150 MBPS per second but according to me it does not give such a great speed and the range is not that high only 10 to 12 metres.
I brought it at 299 rupees And using it for last 9 months without any problems.
They also provide installation CD with it, but I don’t find it useful for installing in Windows 7. You will have to search web forgetting the installation done correctly or call the IT guy which would cost much more than that of the adaptor.
After 4 to 5 hours of continuous work sometimes it gets heated but that’s normal as it is Compaq device .
I bought this as I was having a wired modem of BSNL and wanted my mobile to connect to the Internet with the help of my PC that’s why I bought this. I can convert my wired modem into a wifi hotspot I just installed it in my Windows computer and then every time I want share my Internet I just have to plugin dongle and enjoy.
Note:- you can also contact customer care.they gives great help:)