This innovative R-GO HE Ergonomic Mouse features a vertical design with a curved shape and thumb groove, which helps improve circulation, relieve muscle tension and provide comfort and support with a more natural and relaxed hand position. The wireless design provides more freedom of movement with USB receiver included. The Mouse also features customisable buttons for shortcuts to suit you. This medium, right handed Ergonomic Mouse is designed for hands measuring 165 - 185mm and comes in black/silver.