This is a medium-sized wireless mouse (USB type) with an ergonomic design to reduce strain on the wrist. It's a non-gripping EX-G series mouse, focusing on the muscles used to move the wrist and fingers, and is a 2.4GHz 5-button wireless mouse that minimizes physical strain when moving the mouse. I purchased it about a year ago and used it daily. I'm selling it because I bought a new one. - Manufacturer: ELECOM - Model Number: M-XGS30DBSKBK - Color: Black - Shape: Ergonomic Design - Type: Battery-powered - Size: M size (165-180mm) - Retail Price: 7,447 yen (tax included) #SilentMouse #WirelessMouse #ElecomMouse #Elecom #ELECOM #WorkFromHome #ImprovedWorkEfficiency #M-XGS30DBSKBK