ERGONOMIC COMFORT HAND FEELINGFits the contour shape of the palm, are for maximum comfort and support. The thoughtful ring and little finger rest provide extra comfort. The sturdy scroll wheel with rubber makes sure that your hand will not slip when scrolling. IMPROVE WORKING EFFICIENCYWith 3 DPI levels (1000-1200-1600), optical mouse enables you to adjust its sensitivity whenever you want. Its also constructed with 6 buttons with multifunctional functions. Added next/previous functionality buttons provide convenience when web page browsing; A useful computer mouse to improve productivity and efficiency in workplace. STABLE CONNECTION AND POWER EFFICIENT2.4GHz wireless technology and professional chip ensure longer working distance, reaching up to 33ft. This computer mouse will be in sleep mode in 8 minutes of inactivity. Press any button to wake it up. Note: powered by 2*AA battery (not included). Plug and Play SLEEK DESIGNTiny wireless receiver conveniently slots into your computer's USB port, no need to install drivers. (Note: USB receiver is stored in the battery compartment.) Adopted with skin-friendly frosted material, characterized with O-shaped texture on its sides,asymmetric mouse is not only non-slip, anti-sweat and fingerprint resistant for comfortable use, but it also looks very chic and high-end on your desktop. size: 2.7in/7.05cm*4.07in/10.35cm*1.5in/3.86cm