Digio2 Wireless Trackball Mouse, 5-Button Optical, White, MUS-TRIF175W

Dimensions/Weight: 100mm W x 135mm D x 47mm H / Approx. 115g (Receiver and batteries not included) Natural, easy-to-use design. The shape conforms to the hand, making it easy to use even for first-time users. Enjoy long-term comfort.