Logitech MXTB1S Advanced 2.4GHz/Bluetooth Wireless Trackball MX ERGO Purchased in December 2022 and used for about 2 years. This is a used item, so there are signs of use and minor scratches, but there are no major stains or button malfunctions. Included accessories: Outer box, instruction manual, USB cable, receiver Logitech Wireless Trackball MX ERGO MXTB1s (Black) Brand: logicool Mouse/Trackball Type: Trackball Cable Type: Wireless Number of Buttons: 8 buttons Optical Resolution (dpi): 2048 dpi Mouse/Trackball Features: Tilt wheel, DPI switching, Rechargeable Color: Black, Gray Weight (g): 164 g Battery Standard: Proprietary battery