E-3lue Nion 2 EMS110WH White Compact Design Mouse with Retractable Cable Switch Life of 3,000,000 cycles for long-term reliability Small and portable, Nion 2 is the mobile travelers dream Nion 2 is an ultra-fast USB mouse with retractable cord Red Wave optical sensor offers pro-stability, accuracy Shine the light on the mouse-pad and keep you on the track