The Permice-713 L ergonomic mouse for left-handed users prevents the wrist from "bending", which is common with conventional mice, due to the vertical, upward opening of the hand. The vertical ergonomic design ensures that long periods of working with the mouse do not cause pain or even tendovaginitis. Preventively, the mouse can be used to prevent pain. If there are already complaints or overexertion, such as RSI or "tennis elbow", the mouse is particularly recommended because the hand can adopt a gentle, straight posture.