Purchased on Amazon. I used it for about an hour after purchase, but it didn't suit me, so I'm selling it. 【Ergonomic Design】 The MX ERGO S adopts an ergonomic design that fits in the palm of your hand, making it comfortable to use for long periods. 【Trackball Function】 Equipped with a trackball, you can control the cursor without moving the mouse, allowing you to effectively utilize desk space. 【USB-C Charging】 Features the latest USB-C charging port for quick and convenient charging. - Model Name: MX ERGO S - Brand: logi - Trackball Type: Ergonomic - Charging Port: USB-C - Color: Black - Number of Buttons: 2 Thank you for viewing. Connection Method: Bluetooth + Logi Bolt USB receiver Series: Ergo Model Name: MX ERGO