Did you know that the mouse is the most-used computer accessory? This is why it's so important to have a good ergonomic mouse.
The Evoluent 4 Right Bluetooth is a vertical mouse. Because you hold the mouse in a handshake position, you have less lateral wrist-bending and forearm rotation.
Using a non-ergonomic mouse can lead to pain and discomfort in the wrists, forearms and hands. You will have fewer problems with a vertical mouse.