Adesso iMouse T30 Wireless Programmable Ergonomic Trackball Mouse for Windows

• 2.4GHz radio frequency wireless technology

• Works at any angle with a range of up to 30ft with no wires to get tangled

• On/off switch helps conserve battery power

• Vertical design provides better support for forearm, minimizing wrist pain that can come from twisting

• Back and forward Internet navigational buttons are conveniently located on the left side of mouse to provide Internet browser control with minimal hand movement

• Quick and easily adjustable dpi resolution (1000dpi/1500dpi/2000dpi) with switch located beside thumb