Check out this novel ergonomic mouse which fits on your finger so you do not have to move your hands between the mouse and the keyboard. The USB Wireless Finger Mouse works while strapped to the index finger, the button is operated with the thumb. It enhances and speeds up your experience as the user can multi-task to write or type when operating the mouse at the same time.
The $38 Finger Mouse weighs 25g, operates using 2.4GHz (RF) wireless connection at a 1000DPI resolution, comes with a USB alternative connection, and it can work on any surface, even on your trousers. It has a 15 meters working distance and comes with three Index Finger Rings in different sizes.