The different radio frequencies do not change the static shock setting on your computer receiver collar.
Instead, the frequencies are a tool for the central transmitter to communicate with the receiver collar.
The transmitter uses the radio frequency to establish the border that you create for your pet.
If you would like to learn more about radio frequencies try reading How the Radio Spectrum Works.
The radio frequency must match between the wired or wireless invisible fence transmitter and the receiver collar for them to communicate well and keep the dog in the yard.
In-ground invisible fences work by transmitting through a buried wire. The advantage is that the shape and size can be whatever you need.
The collar picks up signals from the buried wire when it gets close.
Wireless invisible fences work by using the radio transmitter to cast a circular perimeter around the area the dog should stay inside.
The collar alerts the dog when it gets too close to the perimeter.