Nulea Wireless Vertical Trackball Mouse - Thumb ControlThis vertical trackball mouse is built for users who spend long hours at a desk and want to reduce wrist and arm strain. The 65° angle positions your hand in a natural handshake position, while the sculpted body with textured surface fits comfortably in your palm throughout the workday. The thumb-controlled trackball lets you navigate without moving your entire arm, helping minimize fatigue during extended use. The smart scroll wheel automatically switches between precision and rapid modes based on your scrolling speed and supports four-directional scrolling for navigating lengthy documents. Connect via Bluetooth or the included USB receiver to up to three devices and switch between them instantly at the touch of a button.Itemweight0.57 poundsProductdimensions4.4 x 3.0 x 5.2 inchesColorD-BlackManuf