The used Logitech Cordless Optical TrackMan is a trackball type mouse that offers wireless connectivity for convenient use. With programmable buttons and an ergonomic design, it provides a comfortable and efficient user experience. The mouse features a scroll wheel for added functionality and comes in a sleek black color. The Logitech brand ensures quality and reliability, making it a great choice for those looking for a dependable trackball mouse for their computer setup. No charger is needed. The transmitter plugs into the computer and the trackball uses 2 AA batteries (not included - originals removed to avoid leakage). These units are in the original package. I have no way to test this unit.