Wave-shaped keyboard with cushioned palm rest, puts ahead of comfort curve without learning curve. With its gradual wave-shaped contour, this keyboard supports actual, varied lengths of fingers. Curved profile has familiar shape and consistently sized keys, so can type with comfort and confidence without relearning how to type. Palm rest helps position hands comfortably on keyboard and offers comfortable place to rest palms when not typing. Wireless trackball M570 with 400dpi resolution. Work in comfort with a stable, sculpted trackball that supports your hand and lets you rest your arm. Unifying receiver the tiny, wireless receiver that stays in laptop and lets you add compatible devices as you need them.