Trust Evo Advanced Wireless Optical Mouse, 8 Buttons, Ergonomic, Rubber Coated, LED Indicators Trust quality: Dutch design and 30+ years of experience in serving over 100 million satisfied customers Optical sensor for accurate control. 4 extra thumb buttons: Windows start menu, Zoom in/out & Browser back/next. Ultimate ergonomic design for long-lasting & comfortable usage. Rubber coated surface for perfect grip. Battery status & mouse speed LED indicators Speed select button (800/1200/1600 dpi). Storable micro USB receiver.