? Precision optical performance in an agile, modern design with USB micro receiver;? 3 buttons with scroll wheel;? 2.4GHz RF technology offers wireless freedom with effective range up to 33ft;? Auto power management helps maintain proper battery levels;? On-board storage compartment protects USB receiver from loss & damage;? Ergonomic shape & no-slip texture provide secure grip;? Low-friction base smoothly glides over work surfaces;? Plug & play installation;? Windows(R) & Mac(R) compatible;? 3-year warranty;? Blue/Black;