It's a beautiful item, used only a few times (^^) Please understand that this is a used item before purchasing. Batteries are not included for safety reasons. Black mouse with a trackball, comes with a convenient carrying case. Style: Wireless (Receiver included) Brand: ELECOM Color: Black Connectivity Technology: USB, 2.4 GHz Wireless Features: Silent buttons Movement Detection Technology: Optical Continuous Operating Time: ‎3 months Compatible Devices: Windows OS and macOS devices with a USB port Other Features: ‎Silent buttons Connection Type: ‎USB, 2.4 GHz Wireless Size: S size Product Dimensions: 8.89 x 7.37 x 0.1 cm; 76.54 g Item Weight: 2.7 ounces ELECOM Mouse Wireless (Receiver Included) Trackball S Size Small Thumb 5 Buttons Silent Black M-MT1DRSBK Other Notes: There are no noticeable stains, but there may be oversights. This is a used item, so please refrain from purchasing if you are looking for a new item or if you are concerned about minor details.