Microsoft Mouse - Bluetooth/Radio Frequency - 2 Programmable Button(s) - Pastel Blue - Wireless - 2.40 GHz - Scroll WheelAll-day comfortErgonomic design promotes neutral hand position.Long battery lifeHolds a charge for up to 15 months.Connect up to three devicesAnd switch seamlessly between them.Natural hand positionFeaturing a soft, easy-to-grip thumb rest for added comfort.Smooth and preciseMachined aluminium scroll wheel, Teflon base and precise tracking sensor allow for easy navigation on a variety of surfaces.Light, durable designFeaturing seamless finishes, in a variety of colours.