The Lifetime Trackball keyboard is a 104-key Windows Compatible keyboard featuring a built-in trackball. It's the perfect solution for users looking to make the move to a trackball and reduce desktop clutter.Like all Lifetime products, the Trackball keyboard is an example of innovative design and engineering. The trackball is ergonomically located below the spacebar for convenient operation - you can move your cursor without lifting your hands from the keyboard. Maintenance is a snap, since the retaining ring is easily removed for cleaning.