Optical Wireless 5-Button Travel Mouse This 5-button wireless optical travel mouse uses the 2.4GHz frequency which avoids interference with other wireless devices. The nano USB receiver can be stored in the bottom of the mouse or just leave it in the USB port of your notebook/netbook. This mouse also has a DPI switch to change between 800 and 1600 DPI. Together with the ergonomic shape, the rubber side grips and the back- and forward buttons this mouse is a real must have! 5 buttons, back- & forward button, scroll wheel and DPI switch(800/1600) 2.4GHz wireless connection Travel dimensions and nano USB receiver included Rubberized finishing