A special mouse designed for the entire hand. Comfort: Reduced muscle tension due to a relaxed position of the fingers and wrist. Four right-handed versions: Distance from wrist to tip of the ring finger: up to 150 mm: Extra Small, 150-170 mm: Small, 170-190 mm: Medium, and 190-210 mm: Large. Three left-handed versions: Distance from wrist to tip of the ring finger: up to 170 mm: Small, 170-190 mm: Medium, and 190-210 mm: Large. Ergonomics: This mouse fits like a glove. Technology: BlueRay sensor for high precision. For your information: Also available in a wireless version. Unnatural postures are a risk factor for developing discomfort in the wrists and forearms. Placing the mouse closer to the body is less stressful for the neck and shoulders. The 3M Anir mouse looks like a joystick but functions just like any other mouse, enhancing productivity during computer work. With this special mouse, the wrist is less bent to the side, and the forearm is less twisted inward. This results in lower muscle activity in the forearm compared to using a standard mouse.