Piavo Optical 1600dpi Ergonomic Vertical Usb Wireless Mouse, BlackExperts advise using an ergonomic mouse as it reduces strain caused by repetitive movements, thereby helping to prevent posture related injury to the shoulders and neck. With an ergonomic mouse like the piavo vertical mouse your wrist remains in a relaxed, natural position without you needing to twist it, thereby noticeably relieving strain on the tendons, hand and arm. You'll enjoy incredible comfort plus maintain a healthy posture with this device.