The ergonomic vertical grip design of the 3M™ Wireless Ergonomic Mouse has been clinically proven to help reduce muscle strain and discomfort associated with carpal tunnel syndrome and repetitive stress injuries compared to using a traditional mouse. 3M™ Wireless Ergonomic Mouse EM550GPS/EM550GPL enhances your comfort by keeping arms and shoulders in a more relaxed, neutral position. Optical USB/PS2 compatible plug and play. For right-handed use.