Logitech M570 Wireless Trackball 910-002833 $59.00 (RRP $109.00)

You've got a different kind of comfort thanks to a leave-in wireless receiver, long. Trackball comfort - Your trackball stays in one place, so you don?t have to move your arm to move your cursor. Its sculpted shape supports your hand to let you work all day in comfort. Wireless freedom - Who wants a cord in the way? The robust wireless connection lets you control your laptop, desktop computer or home theater PC from up to 30 feet (10 meters)* away.