When our Slingbox's are manufactured, they are made in certain areas to certain specifications. If you buy a Slingbox in the a certain area, it will only work in the that area because of the signal types. So, if you buy a Slingbox in Pakistan then it will work in Pakistan. Here is a link from our support site detailing what countries use which signal types.
Hope this helps,
The Slingbox Moderation Team