This seenda wireless trackball mouse is ergonomically shaped to follow the hand’s natural curve, reducing wrist and hand strain during long work or study sessions. The thumb-controlled trackball lets users navigate without moving the mouse itself, and 5 adjustable DPI levels (200/400/800/1200/1600) fine-tune cursor sensitivity for tasks ranging from detailed design work to fast scrolling. Advanced sensors track smoothly across desks, fabric, or other surfaces without needing a mousepad. The mouse connects to up to 3 devices via 2.4G USB receiver or Bluetooth, switching between a home PC, laptop, and tablet with one click. A built-in rechargeable battery (USB-C) eliminates the need for disposable batteries, and the detachable roller ball allows for easy cleaning and maintenance.Condition Notes:This is an Open Box unit that was opened for inspection and is unused, with no signs of use. The bonus light grey cloth that comes with some units is not included (the cloth is not mentioned in the retail packaging). The mouse functions exactly as intended.This item was opened and inspected prior to listing to confirm it functions properly and all parts are included.