i-Rocks IR-7610L-PK 800/ 1600 DPI DIAMOND LASER MOUSE 800 / 1600 dpi high resolution laser technology provides accuracy and precision and allows you to work on most desktop surfaces. Key numbers : 5 buttons Two conveniently located side-buttons allow you to easily go back and forward in your web browser Wide Metal Scroll Wheel and Unique shape design for comfortable operation. Plug-n-Play and Hot Pluggable and blue LED power light.