I received this as a gift, but I'm selling it because I already have one. It's new, unopened, and comes with a receipt. Here's an overview of the product: — ・Brand: Logicool (Logitech) ・Color: Graphite (2-year warranty) ・Connectivity Technology: Bluetooth ・Features: Soundless, Wireless ・Movement Detection Technology: Trackball, Optical ・Number of Buttons: 8 ・Compatible OS: [Bluetooth] Windows 10 or later, macOS 11 or later, iPadOS 14 or later, ChromeOS, Android 9.0 or later [Logi Bolt] Windows 10 or later, macOS 11 or later, ChromeOS