*ONLINE ONLY - Allow extra time for delivery. Ship to store FREE! During checkout select ''Store Pick-up'' as your delivery option.* Adesso iMouse T40 - Wireless Programmable Ergonomic Trackball Mouse. Optical - Wireless - Radio Frequency - 2.40 GHz - No - Black - USB - 4800 dpi - Trackball, Scroll Wheel - 7 Button(s) - Symmetrical. Meet one of the newest models of the Adesso trackball product line, the Adesso iMouse T40. It incorporates the claw grip design where each user can rest the entire hand over the mouse. The trackball location allows users to move the cursor by rotating the trackball with their fingertips to reduce the need of hand movement. It is cable-free by utilizing the 2.4 GHz radio frequency technology, offering a wireless range of up to 30 feet. It's also fully programmable, meaning every mouse button can be customized to your preferred function