The Kensington M01497-M Expert Trackball Mouse is a black wireless mouse that operates via Bluetooth connectivity. It features an ergonomic design with a palm rest for added comfort and support during use. The mouse has a unique trackball feature, which allows for precise and smooth cursor control. With 4 buttons and optical tracking method, this mouse is a convenient and efficient option for controlling your computer or tablet. Uses AA batteries. Comes with the palm rest, but no dongle.