Thank you for viewing this item from among our many products. This is a brand new, unopened Logicool ERGO M575S. I kept it at home as a spare, but I am selling it because I don't use it. To prevent product substitution, we cannot accept returns or cancellations of transactions. Thank you for your understanding. [Ergonomic Design] The shape fits your hand, designed to reduce fatigue even after long hours of use. [Bluetooth Connection] Supports Bluetooth Low Energy, allowing for comfortable wireless use. [Wide Compatibility] Compatible with both Windows and Mac, allowing use with a wide range of devices. - Brand: logicool - Model Name: ERGO M575S - Connectivity: Bluetooth Low Energy - Supported OS: Windows, Mac - Features: Ergonomic Design - Accessories: USB receiver