The compact contoured design with soft rubber grips keeps you comfortable - even when you're on the go. You'll enjoy smooth cursor control, precise tracking and easy text selection on the surfaces where you use your computer most. The tiny Logitech Unifying receiver connects up to six Unifying-compatible devices with a powerful, reliable wireless connection. You can go a long time without battery hassles. The on/off switch helps conserve power, smart sleep mode extends battery life and an indicator light eliminates surprises.