The user can set a rotation (the direction the teleport will send him), the power (the amount of power the telepad will use, basically the x velocity) and the angle (which is the y velocity).
The random factor is that the power is randomly offset everytime you recalibrate the telepad.
There is a delay between each use of the teleport, which is calculated by the time it takes for a projectile to hit a destination.
There is also a delay determined by the amount of power you use.
Added a manual for telescience, which links to the wiki.
Giacomand
0c5cd7d8ac