Phone Jack uses hardware-based echo cancellation and compression to remove echoes and time lags between responses as much as possible. The add-on card reduces the load on the computer's central processor. Your regular telephone plugs into the back of the Phone Jack card, and the phone rings when you receive an Internet phone call. To make a call, simply pick up the telephone and call. If you prefer, you can also call using a microphone and the computer's speakers.
Minis are for laptop users or small hands.
Using a standard mouse ball, it's twice the size of Atek's mouse, but half the size of a regular desktop mouse. Connection is through the USB port. It includes a wheel that allows you to scroll up and down a page without moving the mouse. I think the extra precision matters little, and cleaning is easy. Cordless is nice.